16 (at introduction) 18 (currently)
Unnamed Parents (Deceased)
AppearanceTaiju during winter.
He is an outgoing person. As shown as to how he does everything through extreme lengths such as how he loves Yuzuriha and wanted to tell his feelings for the last 5 years. He is very much determined. 
Abilities and Skills
Taiju possesses an extremely sturdy body, something his friend Senku vouches for him. He is the first human to be able to withstand a kick from Tsukasa without losing consciousness. He also possesses immense stamina, able to cross 80 kilometers in 5 hours. Asagiri Gen has also noted that his stamina is immense. He is also the strongest man for endurance after Tsukasa was put in cryosleep and Hyouga incarcerated. Magma, Ginrou, and Yo notably respect Taiju due to his perk of "limitless stamina" that surpasses even the strongest man in Ishigami Village.
- He moves faster and brings with him some loot.
Chapters This Section is Unfinished, Add on to it
- Taiju's name is composed of "tai" (大 big; large) and "ju" (樹 tree) to create Taiju (Big Tree), while Ōki is composed of "ō" (大 big; large) and "ki" (木 tree) to create Ōki (Big Tree).
- Making his name mean Big Tree Big Tree.
|Male||Taiju Oki • Senku Ishigami • Gen Asagiri • Chrome • Kaseki • Kinro • Ginro • Magma • Kokuyo • Ryusui Nanami • Matsukaze • Tsukasa Shishio • Hyoga • Mozu|
|Female||Yuzuriha Ogawa • Ruri • Kohaku • Suika • Nikki Hanada • Minami Hokutozai • Kirisame • Homura Momiji|
|Male||Byakuya Ishigami • Gen Asagiri • Hyoga • Ryusui Nanami • Senku Ishigami • Shamil Volkov • Taiju Oki • Tsukasa Shishio • Ukyo Saionji • Yakov Nikitin • Yo Uei|
|Female||Connie Lee • Darya Nikitina • Homura Momiji • Lillian Weinberg • Nikki Hanada • Yuzuriha Ogawa • Minami Hokutozai • Mirai Shishio|