Yuka Osada

Yuka Osada (長田 結花, Osada Yuka) is a teenage girl who was bullied by her younger sister, who their parents favored over her, and other girls from her school and basketball team. The emotional stress from this leads to her falling down snow-covered stairs, reviving as the Crane Orphnoch (クレインオルフェノク, Kurein Orufenoku), and slaughtering her sister and the basketball team. Following this, she meets Yuji Kiba and joins him in protecting humans, though she occasionally and secretly kills people she deems "bad guys". Throughout the series, she exchanges texts with Keitaro Kikuchi, eventually developing a semi-romantic relationship with him along the way, and developed a crush on Naoya Kaido, though he does not reciprocate. Near the end of the series, she is mortally wounded by the Bat Orphnoch and killed by Saeko Kageyama.

In an alternate timeline depicted in the film Kamen Rider 555: Paradise Lost, Osada joins Yuji and Kaido in proving to the Human Liberation Army that they were on their side. However, the trio fall into a Smart Brain trap, during which Osada and Kaido are killed by the Elasmotherium Orphnoch.

As the Crane Orphnoch, Osada can fly at incredible speeds, create afterimages, and possesses increased jumping capabilities and lung capacity, and superhuman hearing. Additionally, her film counterpart can assume a Flying Mode (飛翔態, Hishō-tai), gaining larger wings on her collar and sides as well as crane-like legs.

Yuka Osada is portrayed by Yoshika Katō (加藤 美佳, Katō Yoshika).

Naoya Kaido

Naoya Kaido (海堂 直也, Kaidō Naoya) is an overly eccentric young man prone to incredibly fast speeches and constant mood swings who Eiichi Toda, the temporary chief of Smart Brain, sired as the Snake Orphnoch (スネークオルフェノク, Sunēku Orufenoku) to show Yuji Kiba and Yuka Osada how Orphnochs must make allies. In his younger years, Kaido played the guitar, but was sabotaged by his teacher, who destroyed his motor skills in his left hand, forcing him to abandon music. After struggling with his nature as an Orphnoch, Kaido lives with Yuji and Osada despite not sharing their desire to protect humans. Throughout the series, Kaido sides with Smart Brain, becoming Kamen Rider Faiz on one occasion and commander of their Riotroopers on a separate occasion, but his conscience ultimately stops him from committing heinous acts at the last second. Following Osada and Yuji's deaths, Kaido reintegrates into human society. As of the web series Kamen Rider Revice: The Mystery, he took on the alias of Naoto Kamiya (上屋 直人, Kamiya Naoto) and became a guitar instructor.

In an alternate timeline depicted in the film Kamen Rider 555: Paradise Lost, Kaido joins Yuji and Osada in proving to the Human Liberation Army that they were on their side, only to fall into a Smart Brain trap and come under attack by the Elasmotherium Orphnoch. Despite being mortally wounded, Kaido confesses his feelings to Osada before mounting a failed attack on the Elasmotherium Orphnoch, which eats him.

As the Snake Orphnoch, Kaido can spit acidic venom.

Naoya Kaido is portrayed by Mitsuru Karahashi (唐橋 充, Karahashi Mitsuru).

Teruo Suzuki

Teruo Suzuki (鈴木 照男, Suzuki Teruo) is an antisocial young boy whose parents were killed by the Barnacle Orphnoch and was subsequently placed in Smart Brain's orphanage Sousai Children's Home (創才児童園, Sōsai Jidōen) until Naoya Kaido found him and brought him to stay at the Kikuchi laundromat. Near the end of the series, the grasshopper-like Arch Orphnoch (アークオルフェノク, Āku Orufenoku), also known as the Orphnoch King, begins to awaken inside Teruo as it uses the boy's shadow to consume other Orphnochs and mature. Upon awakening and possessing Teruo's body, the Arch Orphnoch battles Takumi Inui and Yuji Kiba until the latter sacrifices himself to help the former defeat the Arch Orphnoch, who Saeko Kageyama secretly places in a stasis tank and goes into hiding with.

The Arch Orphnoch resurfaces during the events of the web-exclusive crossover series Kamen Rider Outsiders, having taken control of Smart Brain and found a new aide in the Smart Queen. While attempting to acquire the Genm Musou Corporation's technology to counter the threat of Zein, the Arch Orphnoch confronts its CEO Kamen Rider Genm before Gai Amatsu intervenes in an attempt to suggest an alliance to fight Zein instead. However, Genm and the Arch Orphnoch refuse and take their leave, with the latter declaring that he would never work with humans.

The Arch Orphnoch possesses the ability to "complete" regular Orphnochs' evolution by removing their humanity, pyrokinesis, the most physical strength out of any Orphnoch, and the use of tentacles and finger lasers capable of destroying regular Orphnochs.

Teruo Suzuki is portrayed by Kayato Watanabe (渡辺 彼野人, Watanabe Kayato) while Shun Kobayashi (小林 俊, Kobayashi Shun) portrays his shadow and the Arch Orphnoch is voiced by Hiroshi Yanaka (家中 宏, Yanaka Hiroshi).

Minor Orphnochs

• Owl Orphnoch (オウルオルフェノク, Ouru Orufenoku): An Orphnoch with enhanced leaping capabilities and sight, claws, and the ability to produce black poisonous gas who can assume the form of an unnamed professor. While working at Yamanote Music University, he attacks his best students, such as Naoya Kaido, believing humans are unfit to have such talent and should live harsh lives instead, until he is killed by Yuji Kiba as the Horse Orphnoch. The Owl Orphnoch is portrayed by Ichiro Ogura (小倉 一郎, Ogura Ichirō).
• Snail Orphnoch (スネイルオルフェノク, Suneiru Orufenoku): An Orphnoch who possesses eye stalks that grant omnidirectional vision, the ability to produce mucus that allows him crawl up walls, a left arm that doubles as a hammer, and can assume the identity of an unnamed masked man. He initially chooses not to kill people, instead stealing food to survive. After Smart Brain hires Naoya Kaido to use the Faiz Gear and serve as their enforcer, the Snail Orphnoch is scared into killing people, quickly developing bloodlust in the process until Takumi Inui gets the Faiz Gear back and uses it to kill the Orphnoch. The Snail Orphnoch is portrayed by Koji Suzuki (鈴木 浩二, Suzuki Kōji).
• Equisetum Orphnoch (エキセタムオルフェノク, Ekisetamu Orufenoku): An Orphnoch who possesses superhuman speed and the ability to produce toxic spores. They are killed by Masato Kusaka as Kamen Rider Kaixa.
• Flying Fish Orphnoch (フライングフィッシュオルフェノク, Furaingufisshu Orufenoku): An Orphnoch who possesses increased swimming capabilities and marksmanship, wrist-mounted fins that can double as melee weapons, the use of a harpoon gun, and can assume the form of an unnamed bicycle riding man, but lacks combat training. He is killed by Takumi Inui as Kamen Rider Faiz. The Flying Fish Orphnoch is portrayed by Ryo Taguchi (田口 亮, Taguchi Ryō).
• Yoshimasa Morishita (森下 義正, Morishita Yoshimasa): The older brother of Yuji Kiba's ex-girlfriend, Chie Morishita. While searching for his sister's murderer, Yoshimasa was attacked by the Flying Fish Orphnoch, who sired him as the Armadillo Orphnoch (アルマジロオルフェノク, Arumajiro Orufenoku), gaining superhuman strength, hard skin, and the use of a sword and shield. Due to a combination of his transformation and hearing others talk negatively of Chie, Yoshimasa goes on an insanity-induced rampage until he is killed by Takumi Inui as Kamen Rider Faiz. Yoshimasa Morishita is portrayed by Toshinobu Matsuo (松尾 敏伸, Matsuo Toshinobu).
• Toadstool Orphnoch (トードスツールオルフェノク, Tōdosutsūru Orufenoku): An Orphnoch who wields a battering ram staff and can emit poisonous spores and as well as assume the form of an unnamed clown. He pursues a young girl named Keiko Kurata until he is killed by Takumi Inui as Kamen Rider Faiz. The Toadstool Orphnoch is voiced by Katsumi Shiono (塩野 勝美, Shiono Katsumi) while Shinya Tatsukawa (立川 真也, Tatsukawa Shin'ya) portrays his human form.
• Shigehisa Aoki (青木 茂久, Aoki Shigehisa): The owner of a pizza parlor and Takumi Inui and Yuji Kiba's boss who can transform into the Dolphin Orphnoch (ドルフィンオルフェノク, Dorufin Orufenoku), gaining increased swimming capabilities, ultrasonic wave detection, and a fin-like sword. Smart Brain forces Shigehisa to kill people until he is defeated by Takumi as Kamen Rider Faiz, who spares him and tells him to resume his human life. Shigehisa Aoki is portrayed by Sarutoki Minagawa (皆川 猿時, Minagawa Sarutoki).
• Frog Orphnoch (フロッグオルフェノク, Furoggu Orufenoku): An Orphnoch who possesses superhuman strength and an acid shooting gun. After surviving an attack by Aki Sawada, the Frog Orphnoch is killed by Saya Kimura as Kamen Rider Delta. The Frog Orphnoch is portrayed by Masashi Morishima (森島 將士, Morishima Masashi).
• Stinkbug Orphnoch (スティンクバグオルフェノク, Sutinkubagu Orufenoku): An Orphnoch who possesses increased stealth capabilities and gas grenades capable of causing vomiting and skin and eye irritation. After being defeated by Takumi Inui and Masato Kusaka as Kamen Riders Faiz and Kaixa respectively, he attempts to kill Mari Sonoda and Keitaro Kikuchi, only to be killed by Yuji Kiba as the Horse Orphnoch. The Stinkbug Orphnoch is voiced by Katsumi Shiono.
• Swordfish Orphnoch (ソードフィッシュオルフェノク, Sōdofisshu Orufenoku): An Orphnoch who wields a pair of swords capable of slicing through iron and producing high-frequency vibrations and can assume the form of an unnamed gorgeous man. He is killed by Takumi Inui as Kamen Rider Faiz. The Swordfish Orphnoch is portrayed by Masaki Tachi (舘 正貴, Tachi Masaki).
• Octopus Orphnoch (オクトパスオルフェノク, Okutopasu Orufenoku): An Orphnoch who can stretch his arms across short distances, produce ink clouds from his nose, and assume the form of a young, unnamed boxer. He is killed by Takumi Inui as Kamen Rider Faiz. The Octopus Orphnoch is portrayed by Yusuke Takahata (高畑 雄亮, Takahata Yūsuke).
• Barnacle Orphnoch (バーナクルオルフェノク, Bānakuru Orufenoku): An arsonist and former employee of Smart Brain who possesses superhuman strength and durability as well as the ability to produce explosive barnacle clusters. After starting fires that would go on to kill Mari Sonoda and Teruo Suzuki's respective parents, the Barnacle Orphnoch was fired and marked for death by Kyoji Murakami for his incompetence and attracting law enforcement. Unaware of Kitazaki's pursuit of him, the Barnacle Orphnoch attempts to steal the Rider Gears, only to be killed by Takumi Inui as Kamen Rider Faiz. The Barnacle Orphnoch is portrayed by Masashi Shirai (白井 雅士, Shirai Masashi).
• Aonuma (青沼): A Ryusei School student who was transformed into the Sloth Orphnoch (スロースオルフェノク, Surōsu Orufenoku), gaining night vision and three sharp claws on each wrist capable of slicing through iron plates, during Kitazaki's attack on the Ryusei School reunion and joined him in slaughtering his classmates until Aonuma was killed by Takumi Inui as the Wolf Orphnoch. Aonuma is portrayed by Kazuma Kurihara (栗原 一馬, Kurihara Kazuma).
• Crab Orphnoch (クラブオルフェノク, Kurabu Orufenoku): An Orphnoch with a pincer for a left hand and an enhanced sense of hearing. He was captured and used by human scientists led by Masahiko Minami as a guinea pig until he heard the similarly captive Yuka Osada's screams and breaks out of his confinement to rescue her. After transferring her to Yuji Kiba's custody, the Crab Orphnoch attempts to flee, but ultimately dies from the Orphnochs' genetic flaw. The Crab Orphnoch is voiced by Satoshi Matsuda (松田 悟志, Matsuda Satoshi).

Kyoji Murakami

Kyoji Murakami (村上 峡児, Murakami Kyōji), also known as the Rose Orphnoch (ローズオルフェノク, Rōzu Orufenoku), is the underhanded chief of Smart Brain and successor to temporary chief Eiichi Toda following Toda's defeat at Kamen Rider Faiz's hands. Murakami is later overthrown by Hanagata and replaced with Yuji Kiba. Despite this, he seeks out the Arch Orphnoch in the hopes of correcting the Orphnochs' genetic instability, giving his life to awaken him.

In an alternate timeline depicted in the film Kamen Rider 555: Paradise Lost, Murakami was reduced to a head in a jar, but retains a significant command position in Smart Brain until the Elasmotherium Orphnoch fails to kill Takumi Inui and Murakami is murdered by Smart Lady on his superiors' orders.

As the Rose Orphnoch, Murakami possesses levitation, pyrokinesis, increased durability compared to most Orphnochs, and the ability to generate rose petals to damage or distract opponents.

Kyoji Murakami is portrayed by Katsuyuki Murai (村井 克行, Murai Katsuyuki).

Smart Lady

Smart Lady (スマートレディ, Sumāto Redi) is the "mascot" of Smart Brain who works closely with the company's chief and helps fledgling Orphnochs. While she acts friendly and playful towards the many workers at Smart Brain, she does not realize that no one enjoys her company.

Smart Lady is portrayed by Hitomi Kurihara (栗原 瞳, Kurihara Hitomi).

Riotroopers

Riotroopers (ライオトルーパー, Raiotorūpā) are Smart Brain's personal army of foot soldiers who all utilize mass-produced Smart Buckle (スマートバックル, Sumāto Bukkaru) belts.

Lucky Clover

The Lucky Clover (ラッキークローバー, Rakkī Kurōbā) are an elite quartet of Orphnochs who answer directly to Smart Brain's Chief.

Minor members

• Hiroshi Izawa (井沢 博司, Izawa Hiroshi): A traveler who transform into the Stingfish Orphnoch (スティングフィッシュオルフェノク, Sutingufisshu Orufenoku), gaining the ability to transform further into a merman-esque Swimming Mode (遊泳態, Yūei-tai). He is sent to retrieve the Faiz Gear, only to be killed by Takumi Inui as Kamen Rider Faiz. The Stingfish Orphnoch is portrayed by Masanobu Kinoshita (木下 政信, Kinoshita Masanobu).
• Elephant Orphnoch (エレファントオルフェノク, Erefanto Orufenoku): An Orphnoch who wields a cannon, can transform from his regular humanoid Fight Mode (格闘態, Kakutō-tai) to his giant centaur-like Charge Mode (突進態, Tosshin-tai), and assume the identity of an unnamed biker. He attempts to steal the Faiz Gear, attacking Mari Sonoda in the process, until he is killed by Takumi Inui as Kamen Rider Faiz. The Elephant Orphnoch is portrayed by Tatsumi Nagasawa (永沢 巽, Nagasawa Tatsumi).
• Aoki (青木): A bounty hunter and associate of Midorikawa and Akai's who can transform into the Ox Orphnoch (オックスオルフェノク, Okkusu Orufenoku), gaining giant horns on the sides of his head, superhuman strength, and giant wrecking ball-like fists. He is tasked with retrieving the Faiz Gear, only to be killed by Takumi Inui as Kamen Rider Faiz. Aoki is portrayed by Hitohiro Tanaka (田中 仁浩, Tanaka Hitohiro).
• Midorikawa (緑川): A bounty hunter, associate of Aoki's, and senior partner to Akai who can transform into the Mantis Orphnoch (マンティスオルフェノク, Mantisu Orufenoku), gaining increased jumping capabilities and eyesight as well as sickle-like blades that he wields in a reverse grip. While attempting to retrieve the Faiz Gear, he is betrayed and killed by Akai as Kamen Rider Faiz. Midorikawa is portrayed by Mikio Sato (佐藤 幹雄, Satō Mikio).
• Akai (赤井): A bounty hunter, associate of Aoki's, and junior partner to Midorikawa who can transform into the Cactus Orphnoch (カクタスオルフェノク, Kakutasu Orufenoku), gaining a spine-covered body and the ability to shoot off said spines. While working with Midorikawa to retrieve the Faiz Gear, Akai uses it to betray and kill him until Keitaro Kikuchi retrieves the Fair Gear for Takumi Inui, who uses it to kill Akai in turn. Akai is portrayed by Katsuyuki Yamazaki (山﨑 勝之, Yamazaki Katsuyuki).
• Eiichi Toda (戸田 英一, Toda Eiichi): The temporary head of Smart Brain who can transform into the Squid Orphnoch (スクィッドオルフェノク, Sukuiddo Orufenoku), gaining teleportation capabilities and the use of an umbrella-like staff capable of producing ink that can destroy humans' hearts. He came to Japan to locate the Faiz Gear, but is reassigned to help Yuji Kiba and Yuka Osada better understand their new Orphnoch forms. When the pair refuse to sire more Orphnochs, Toda attempts to set an example for them by going on a rampage, siring Naoya Kaido as the Snake Orphnoch in the process, only to be killed by Takumi Inui as Kamen Rider Faiz. Eiichi Toda is portrayed by Shigeki Kagemaru (影丸 茂樹, Kagemaru Shigeki).
• Scarab Orphnoch (スカラベオルフェノク, Sukarabe Orufenoku): An Orphnoch with armor-like skin, superhuman strength, a rapier, a back-mounted shield, and antlers capable of picking up radio and sound waves who can assume the identity of an unnamed, bespectacled man. He is assigned to retrieve the Faiz Gear by tailing Takumi Inui, who uses the Faiz Gear to kill him. The Scarab Orphnoch is portrayed by Masazumi Yagi (八木 正純, Yagi Masazumi).
• Oonogi (大野木, Ōnogi): A potential candidate for J's replacement in the Lucky Clover who can transform into the Scorpion Orphnoch (スコーピオンオルフェノク, Sukōpion Orufenoku), gaining superhuman strength and the use of a flail, only to be killed by Takumi Inui as Kamen Rider Faiz. Oonogi is portrayed by Teppei Sakata (坂田 鉄平, Sakata Teppei).
• Koichi (浩一, Kōichi): A potential candidate for J's replacement in the Lucky Clover who can transform into the Worm Orphnoch (ワームオルフェノク, Wāmu Orufenoku), gaining the use of a giant crescent-shaped blade, only to be killed by Masato Kusaka as Kamen Rider Kaixa. Koichi is portrayed by Kei Tamura (田村 圭生, Tamura Kei).
• Sea Cucumber Orphnoch (シーキュカンバーオルフェノク, Shīkyukanbā Orufenoku): A potential candidate for J's replacement in the Lucky Clover who can produce acidic mucus from his hands capable of melting concrete and assume the form of an unnamed salaryman. He is killed by Takumi Inui as Kamen Rider Faiz. The Sea Cucumber Orphnoch is portrayed by Tatsuro Kawano (河野 達郎, Kawano Tatsurō).
• Yoshio Kobayashi (小林 義雄, Kobayashi Yoshio): A young man who recently became the Rabbit Orphnoch (ラビットオルフェノク, Rabitto Orufenoku) and attempted to commit suicide before being saved by and falling under Naoya Kaido's wing. In the hopes of joining the Lucky Clover, the pair steal the Faiz and Kaixa Gears, but are told by Kyoji Murakami that only one of them can join and the position will go to whoever kills Yuji Kiba. Taking Kaido's words to heart, Kobayashi kidnaps Yuka Osada, which angers Kaido. Kobayashi escapes from Yuji, Osada, and Kaido, only to be killed by Masato Kusaka as Kamen Rider Kaixa. Yoshio Kobayashi is portrayed by Masato Uchiyama (内山 眞人, Uchiyama Masato).
• Rhinoceros Beetle Orphnoch (ライノセラスビートルオルフェノク, Rainoserasu Bītoru Orufenoku): An Orphnoch serving under Kyoji Murakami who possesses samurai-like chain mail armor and wields a halberd. He is killed by Masato Kusaka as Kamen Rider Delta. The Rhinoceros Beetle Orphnoch is portrayed by Kota Otsuka (大塚 幸汰, Ōtsuka Kōta).
• Stag Beetle Orphnoch (スタッグビートルオルフェノク, Sutaggu Bītoru Orufenoku): An Orphnoch serving under Kyoji Murakami who possesses samurai-like armor and a forked staff. He is killed by Shuji Mihara as Kamen Rider Delta. The Stag Beetle Orphnoch is portrayed by Seiki Chiba (千葉 誠樹, Chiba Seiki).
• Pigeon Orphnoch (ピジョンオルフェノク, Pijon Orufenoku): An Orphnoch serving under Itsuro Takuma who possesses sharp claws, shurikens made from his feathers, and flying capabilities. He is killed by Yuji Kiba as Kamen Rider Faiz. The Pigeon Orphnoch is portrayed by Akinori Aoto (青戸 昭憲, Aoto Akinori).
• Okra Orphnoch (オクラオルフェノク, Okura Orufenoku) An associate of Kitazaki's who wields an axe, a net, and a helmet that grants increased headbutting capabilities. He assists Kitazaki in attacking Takumi Inui as Kamen Rider Faiz, who eventually kills the Okra Orphnoch. The Okra Orphnoch is voiced by Katsumi Shiono.
• Frilled Lizard Orphnoch (フリルドリザードオルフェノク, Furirudo Rizādo Orufenoku): An associate of Saeko Kageyama's who wields a rapier and shield. He joins her in testing Yuka Osada's abilities until he is killed by Takumi Inui as Kamen Rider Faiz. This Okra Orphnoch is voiced by Katsumi Shiono.
• Bat Orphnoch (バットオルフェノク, Batto Orufenoku): An Orphnoch who wields two pistols and shoulder-mounted blades that can double as boomerangs and can assume the form of an unnamed man wearing sunglasses. While aiding Masahiko Minami on Kyoji Murakami's orders, the Bat Orphnoch mortally wounds Yuka Osada and fights Naoya Kaido and Shuji Mihara as Kamen Rider Delta before Takumi Inui as Kamen Rider Faiz kills the Bat Orphnoch. The Bat Orphnoch is portrayed by Taishin Otsuka (大塚 太心, Ōtsuka Taishin).
• Coral Orphnoch (コーラルオルフェノク, Kōraru Orufenoku): An Orphnoch who possesses the ability to fire a gel solution capable of immobilizing targets from his three tube-like mouths, increased durability, a rod-covered body capable of diffusing melee attacks, and wields a double-headed spear and can assume the form of an unnamed leather jacketed man. After being targeted by Teruo Suzuki, the Coral Orphnoch reveals the child's existence to Kyoji Murakami before attempting to kill Teruo before he can become the Orphnoch King, only to be killed by Takumi Inui and Shuji Mihara as Kamen Riders Faiz and Delta respectively. The Coral Orphnoch is portrayed by Kairi Narita (成田 浬, Narita Kairi).

Hanagata

Hanagata (花形) is the founder and former chief of Smart Brain who can transform into the Goat Orphnoch (ゴートオルフェノク, Gōto Orufenoku) and sought to evolve mankind for the better. To this end, he secretly took in orphans and had them experimented on to determine their potential for evolving into Orphnochs and locate the Arch Orphnoch. Furthermore, he developed the Rider Gears, most of which can only be used by Orphnochs or humans implanted with a sufficient amount of Orphnoch DNA, to protect the Arch Orphnoch once they were found. However, he discovered he was dying due to his Orphnoch nature, realized the error of his ways, and disappeared, taking the Rider Gears with him in the hopes of stopping humanity from becoming monsters. He would go on to become the Ryusei School's foster father and secretly give them the Rider Gears, believing they would be able to stop the other Orphnochs, and watched over them from the shadows for years.

In the present, Hanagata resurfaces to aid Takumi Inui and Masato Kusaka by giving them new equipment before stripping Smart Brain's current chief, Kyoji Murakami, of his duties and appointing Yuji Kiba as the permanent head of the company in response to the Arch Orphnoch's eventual awakening. While attempting to see his students, Mari Sonoda and Rina Abe, one more time, he is stopped by Kusaka, who learned of Hanagata's true nature as an Orphnoch. Hanagata stops him from transforming, but ultimately dies telling Kusaka to keep living due to miscalculating his time of death.

As the Goat Orphnoch, Hanagata possesses superhuman strength, speed, and agility as well as sharp horns. Additionally, he is trained in kenpō.

Hanagata is portrayed by Koji Naka (中 康治, Naka Kōji).

Rina Abe

Rina Abe (阿部 里奈, Abe Rina) is a former alumnus of the Ryusei School who worked at Sousai Children's Home. She and her fellow alumni initially attempt to find a suitable user for the Kaixa Gear before most of them fall victim to the Delta Gear's addictive side effect. Abe temporarily takes up the mantle of Kamen Rider Delta and overcomes the side effect, but her lack of combat prowess forces her to give it to her friend Shuji Mihara, who initially refuses. After being hospitalized while retrieving the Delta Gear, she inspires Mihara to use it to fight the Orphnochs and goes on to become the head of Sousai Children's Home.

Rina Abe is portrayed by Rie Kasai (河西 りえ, Kasai Rie).

Kyosuke Tokumoto

Kyosuke Tokumoto (徳本 恭輔, Tokumoto Kyōsuke) is a Ryusei School alumnus who tries to use the Kaixa Gear, but failed to out of fear due to its fatal side effects. After finding and using the Delta Gear before it was stolen by former classmate Aki Sawada, Tokumoto comes to believe that it is rightfully his due to its megalomaniacal side effects and joins forces with Ken Arai to kidnap Mari Sonoda in an attempt to lure out Sawada and take the Delta Gear back, only to be killed by Sawada.

Kyosuke Tokumoto is portrayed by Shun Saeki (佐伯 俊, Saeki Shun).

Shuji Mihara

Shuji Mihara (三原 修二, Mihara Shūji) is an initially cowardly and pessimistic alumnus of the Ryusei School who desires to live a normal life and not involve himself with the Orphnochs. After his classmate Rina Abe is hospitalized in a vehicular accident while retrieving the Delta Gear, Mihara resolves to overcome his cowardice and join Takumi Inui and Masato Kusaka in fighting the Orphnochs as Kamen Rider Delta (仮面ライダーデルタ, Kamen Rider Deruta). After helping Takumi Inui and Yuji Kiba defeat the Arch Orphnoch, Mihara joins Abe in running the Sousai Children's Home.

Mihara utilizes the Delta Gear's SB-333B Delta Driver (SB-333B デルタドライバー, SB-333B Deruta Doraibā) belt in conjunction with the SB-333P Delta Phone (SB-333P デルタフォン, SB-333P Deruta Fon) walkie-talkie and the SB-333DV Delta Mover (SB-333DV デルタムーバー, SB-333DV Deruta Mūbā) camcorder to transform. While transformed, he can combine the SB-333P Delta Phone and SB-333DV Delta Mover to access the latter's Blaster Mode (ブラスターモード, Burasutā Mōdo), which has an alternate Pointer Mode (ポインターモード, Pointā Mōdo) that allows him to perform the Lucifer's Hammer (ルシファーズハンマー, Rushifāzu Hanmā) Exceed Charge. Additionally, he possesses the SB-VX0 Jet Sliger (SB-VX0 ジェットスライガー, SB-VX0 Jetto Suraigā) combat motorcycle. Unlike the other Rider Gears, the Delta Gear can be used by humans and Orphnoch, though it induces megalomania in most of its users.

Shuji Mihara is portrayed by Atsushi Harada (原田 篤, Harada Atsushi).

Minor members

• Saya Kimura (木村 沙耶, Kimura Saya): The first user of the Delta Gear who takes on a part-time job at Kikuchi Dry Cleaning and intended to hand off the Delta Gear to Takumi Inui before she is killed by Aki Sawada. Saya Kimura is portrayed by Mai Saito (斉藤 麻衣, Saitō Mai).
• Kiyotaka Nishida (西田 清高, Nishida Kiyotaka): An alumnus who temporarily assumes the Kaixa Gear, using it to deplete the Crocodile Orphnoch's first life, only to die in Mr. Masuda's arms due to the Kaixa Gear's fatal side effect. Kiyotaka Nishida is portrayed by Yoshiaki Kawasaki (河崎 芳明, Kawasaki Yoshiaki).
• Takahisa Shindo (神道 貴久, Shindō Takahisa): An alumnus who uses the Kaixa Gear to battle the Crocodile Orphnoch against his classmates' protests, only for the Orphnoch to knock the belt off of him, causing Shindo to revert and disintegrate from the belt's fatal side effect. Takahisa Shindo is portrayed by Shintaro Chikada (近田 慎太郎, Chikada Shintarō).
• Asami Ito (伊藤 麻美, Itō Asami): An alumnus who tries to take the Delta Gear, only to be killed by Yuki Kawachi. Asami Ito is portrayed by Kaoru Kurasawa (倉澤 薫, Kurasawa Kaoru).
• Ken Arai (新井 賢, Arai Ken): An alumnus who temporarily uses the Delta Gear and became obsessed with it due to its megalomaniacal side effect. He joins forces with Kyosuke Tokumoto to kidnap Mari Sonoda, lure Aki Sawada into a trap, and get the Delta Gear back, only to be killed by Sawada. Ken Arai is portrayed by Hirohito Honda (本田 博仁, Honda Hirohito).
• Yuki Kawachi (河内 勇樹, Kawachi Yūki): An alumnus who briefly uses the Delta Gear, succumbs to its side effect, and attacks Ken Arai and kills Asami Ito over it. After being attacked and fatally wounded by the Frog Orphnoch, Kawachi calls Masato Kusaka for help and claims that Aki Sawada had taken the Delta Gear before dying of his injuries. Yuki Kawachi is portrayed by Kenta Hinokio (檜尾 健太, Hinokio Kenta).