Akaba is a member of the Hokuto Three Crows and a supporting protagonist in Kamen Rider Build. He originally took part in the Hokuto invasion of Touto but later defected to Team Build along with his boss Kazumi Sawatari after Seito occupied Hokuto.
Personality[]
Masaru Ooyama is a delinquent right down to his appearance and personality. He is cruel and careless, not hesitating to attack a civilian population out of boredom. Masaru sees himself as superior to his comrades, barring his boss, who he deeply respect.
Crossover War Heroes: Iron-Blooded Kid Warriors[]
Masaru Ooyama made a debut as one of Dong Zhuo's henchmen. He accompanies and abuses Hiroki Nagase as prisoner. Suddenly, Hiroki successfully escapes. He and his friends started pursuing him. However, he and his friends were quickly stopped by Milinda Brantini and her friends. After the redemption is successful, Masaru and his friends joined forces with Milinda Brantini and Tekkadan to end chaotic wars.
After the defeat of the Bruters and the death of Yan Baihu, he and his friends continued their journey to earth. Eiji and the rest of many heroes spend time in order for themselves to be relaxed. However, he and the others were shocked that Yugo Ogami and Alice Tsukagami were kidnapped by Gjallarhorn after Leo Conrad and Sally Land were recruited. He and the heroes must have a meeting with Dr. Dan and his companions. When the meeting was done, he and the heroes continued their journey. Suddenly, he and the heroes were confronted by the combined forces of Yuinshiel Asteria and Vladilena Milizé, including the Sword of Logos Kamen Riders. Following the defeats of Julieta Juris and the Time Jackers, he and the others had mourned the deaths of Leo Conrad and Sally Land.
After the deaths of Leo Conrad and Sally Land, he and the heroes went on a meeting with Hina Amano's family and the Fenix Group. In order to continue adventures, he and the heroes train more to get strong with each other. After the meeting with Hina Amano's family and the Fenix Group, he and the heroes set off to rescue Mana Nagase and her friends from Gunther Prozen's tyranny. So that, he and the heroes can still keep fighting.
Following Thaddeus Valentine's demise, he and the heroes must look after Mana Nagase and her friends, who were former humans under Prozen and Deadmans' experimental activities. Eiji has no other choice but to protect them. He needs more duty from Marika Kato. So that, his efforts won't become a failure.
Allies and enemies[]
Allies: Hibiki Tachibana, Tsubasa Kazanari, Chris Yukine, Maria Cadenzavna Eve, Shirabe Tsukuyomi, Kirika Akatsuki, Miku Kohinata, Souji Tendou/Kamen Rider Kabuto, Arata Kagami/Kamen Rider Gatack, Ruuji Familon, Arashi (Zoids), Midori, Heero Yuy, Kira Yamato, Setsuna F. Seiei, Bugs Bunny, Marika Kato, Sento Kiryu/Kamen Rider Build, Milinda Brantini, Dominic Toretto, Greg Heffley, Tsubomi Kido, Wade Owen Watts, Shouya Ishida, Hei (Darker than Black), Ryuga Banjou/Kamen Rider Cross-Z, Soichi Isurugi, Misora Isurugi, Sawa Takigawa, Eiji Hino/Kamen Rider OOO, Professor Kukui, Professor Burnet, Kouta Kazuraba/Kamen Rider Gaim, Kaito Kumon/Kamen Rider Baron, Mitsuzane Kureshima/Kamen Rider Ryugen, Takatora Kureshima/Kamen Rider Zangetsu/Zangetsu Shin, Suzuka Kamiki, Gas-House Gorillas, Kazumi Sawatari/Kamen Rider Grease, He Jin, Hyde Kido, Bastion Misawa, Horrid Henry, Mirei Mikagura, Etemon, Volcamon, Yūna Yūki, Mimori Tōgō, Fu Inubouzaki, Itsuki Inubouzaki, Karin Miyoshi, Sonoko Nogi, Hiroki Nagase, Syuuya Aikawa/Aoba, Syoukichi Mihara/Kiba, Wataru Kurenai/Kamen Rider Kiva, Kivat-bat the 3rd, Kate Green, Gentoku Himuro/Night Rogue/Kamen Rider Rogue, Rinna Sawagami, Nariaki Utsumi, Akari Tsukimura, Leena Toros, Aila Jyrkiainen, Mitsuya Majime, Hester Shaw, Kouhei Araki, Jiro, Ramon, Riki, Futaba Ichinose, Chitose Karasuma, Kenzo Tenma, Kudelia Aina Bernstein, Atra Mixta, Leo Conrad, Sally Land, Seraphimon, Cherubimon (Good), Ophanimon, Guardian Eatos, Carly Carmine, Naoto Kurogane, Hina Amano, Yugi Muto/Yami Yugi (Atem), Joey Wheeler, Tristan Taylor, Téa Gardner, Aichi Sendou, Ruko Kominato, Dan Bashin, Gao Mikado, Ayato Kamina, Yuinshiel Asteria, Rena Asteria, Knight Unryuji, Kuroto Dan/Kamen Rider Genm, Hazuki Kagimura, Touma Kamiyama/Kamen Rider Saber, Rintaro Shindo/Kamen Rider Blaze, Kento Fukamiya/Kamen Rider Espada, Ren Akamichi/Kamen Rider Kenzan, Ryo Ogami/Kamen Rider Buster, Tetsuo Daishinji/Kamen Rider Slash, Grizzly Bear, Panda Bear, Ice Bear
Enemies: Gunther Prozen, Thaddeus Valentine, Hajime Busuzima, Thornheart (deceased; killed by Milinda Brantini), Dr. Ellie Staple, Kain (RESTOL Special Rescue Squad) (deceased), Flinty McCallahan (deceased), Greta Hideg, Matori, Dr. Zager, Gozu (Pokemon), Mikie Okamine, Masakuni Mido, Jail Scaglietti, Gabby Jay, Alva, Rustal Elion, Carta Issue, Iok Kujan, Gallus Bauduin, Elek Falk, Iznario Fareed, Nemo Baklazan, Julieta Juris, Wolf Rocky, Knight Unryuji (formerly), Shia Kijima, Wilfrid Kijima, Saga Adou, Swartz, Uhr, Ora, Tid
Former Enemies: Marika Kato, Sento Kiryu/Kamen Rider Build, Milinda Brantini, Dominic Toretto, Greg Heffley, Tsubomi Kido, Wade Owen Watts, Shouya Ishida, Hei (Darker than Black), Ryuga Banjou/Kamen Rider Cross-Z, Soichi Isurugi, Misora Isurugi, Sawa Takigawa, Eiji Hino/Kamen Rider OOO, Professor Kukui, Professor Burnet, Kouta Kazuraba/Kamen Rider Gaim, Kaito Kumon/Kamen Rider Baron, Mitsuzane Kureshima/Kamen Rider Ryugen, Takatora Kureshima/Kamen Rider Zangetsu/Zangetsu Shin, Suzuka Kamiki, Gas-House Gorillas, Kazumi Sawatari/Kamen Rider Grease, He Jin, Hyde Kido, Bastion Misawa, Horrid Henry, Mirei Mikagura, Etemon, Volcamon, Yūna Yūki, Mimori Tōgō, Fu Inubouzaki, Itsuki Inubouzaki, Karin Miyoshi, Sonoko Nogi, Hiroki Nagase, Syuuya Aikawa/Aoba, Syoukichi Mihara/Kiba, Wataru Kurenai/Kamen Rider Kiva, Kivat-bat the 3rd, Kate Green, Gentoku Himuro/Night Rogue/Kamen Rider Rogue, Rinna Sawagami, Nariaki Utsumi, Akari Tsukimura, Leena Toros, Aila Jyrkiainen, Mitsuya Majime, Hester Shaw, Kouhei Araki, Jiro, Ramon, Riki, Futaba Ichinose, Chitose Karasuma
Gallery[]
