This is a list of characters of the 2010-2011 Japanese tokusatsu series Kamen Rider OOO.
Eiji Hino (火野 映司 Hino Eiji) is a young man desire to helps others while traveling. When he falls asleep during his part-time job at the museum, Eiji unwittingly becomes entangled in the chain of events that occurred after the Greeed were released and gains the ability to become Kamen Rider OOO (仮面ライダーオーズ Kamen Raidā Ōzu) to fight them.
Eiji Hino is portrayed by Shu Watanabe (渡部 秀 Watanabe Shū).
Ankh (アンク Anku) is the bird-type Greeed, a dishonest wildcard who sees people for their flaws and is at odds with the other Greeed. Ankh also believes that he has the right to get whatever he wants and detests having to give something away. Eight centuries ago, Ankh conspired with the original OOO and battle the rest of the Greeed before being betrayed by OOO when all the other Greeed were defeated. He was impaled by OOO's Tora Claws, having his Core Medals stolen. When the original OOO attempted to absorb all the Medals' power, it resulted in the Greeed being sealed away, including Ankh. However, Ankh's right forearm, holding the Core Medal containing his consciousness, was severed in the process and sealed with the other Greeed while his mindless body, mummified and dormant, ended up in Europe. As a result, he lost most of his powers. When the Greeed were unsealed, Ankh was only able to manifest back into existence as his right forearm and stole some of the other Greeed's Core Medals to have them handicapped. However, he loses one of his two remaining Taka Medals when Eiji takes it by accident. Ankh originally intends to force Eiji to return his Medal, only to be saved by Eiji from the Mantis Yummy sent after him. In a dire need to see that both of them survive the Yummy attack, and intending to make Eiji a pawn in his scheme (as he can not create a Yummy in his condition), Ankh saves the human by lending him the OOO Driver and some of the Core Medals he has, enabling Eiji to transform into Kamen Rider OOO.