Kamen Rider Todoroki (仮面ライダー轟鬼 Kamen Raidā Todoroki, lit. "Masked Rider Roaring Demon") is one of the many Oni Kamen Riders in the Kamen Rider Series Kamen Rider Hibiki. He solely goes by the name Todoroki (トドロキ Todoroki) and abandoned his human name Tomizo Todayama (戸田山 登巳蔵 Todoyama Tomizō) upon becoming an Oni.
He is the last Oni to join the main cast of the show. Despite that he is the second oldest Oni of the core three at 26, he is still very much a novice. A green Oni, both in color and appearance, he is still learning how the world around him works. Having only just become an independent Oni during his introduction, he sticks close to Hibiki and Ibuki and looks to them for guidance. Eager to do please his master but do things in his own style, he often meets conflicting points of views from others, but continues on with what he believes is "his" way. Todoroki was the last of the main series' Oni to be introduced. He was first seen in episode 13 greeting Asumu's mother at a hospital. He later returned with his master, Zanki, to fend off a pair of Makamou. Originally he was to be the next Zanki, but declined the offer from his master so that he could create his own legacy as Todoroki.
Of the three main Oni, Todoroki is the second oldest, yet he is the most childish. He still acts like a novice with many Oni matters and enjoys the simple things that life has to offer him. He is also one of the more clumsy characters on the show, this trait often leads to problems both in and out of battle. Even though often misguided, Todoroki will stand by his friends no matter what comes their way.
When he became a solo Oni, Zanki had some trouble accepting the way that he fought the Oni and his "cleansing" of the battlefield. Eventually Zanki came to accept that this was Todoroki's way of being an Oni. During the summer of training arc, Todoroki saw Hibiki as a teacher, and Hibiki offered Todoroki guidance on being a solo Oni and the new challenges that life would bring him now that he had no master.
Todoroki soon came to find fighting the Oni on his own to be a tough challenge. In response to this, Zanki returned to be his supporter and offer advice whenever he could.
Throughout the series, Todoroki had a crush on Hinaka Tachibana. One day he gathers enough courage to asks her out on a date on her birthday. The date goes horribly wrong for Todoroki, he makes a fool of himself and ruins her gift. Hinaka became upset with Todoroki and the two were distant with each other for a while.
Late in the series after the Shuki incident, Todoroki was literally stepped on by a giant Makamou. This left the others questioning whether or not Todoroki would ever be able to transform again. Zanki feared this would cause Todoroki to go into a state of depression, indeed it does. Zanki believes that Todoroki was born to be an Oni and that he knows no other way of life. Eventually Zanki meets his end, but puts a spell on his soul to allow him to remain on earth until Todoroki no longer needs him. It was around this time that Hinaka and Todoroki became friends again, even though she offered her help to teach him how to walk again, Todoroki declined. Even when Zanki helped him out, Todoroki said he wanted to do it on his own, otherwise he would never be able to show that he is an independent warrior.
Todoroki learns to walk again and rushes into Zanki's final battle, the both make quick work of a large number of Makamou and soon it is time for Zanki to pass on. Todoroki and Zanki have one final cleansing session as Todoroki pays his final respects to his former master. After these events, Todoroki has finally become the man that he always wanted to be.
While the Orochi is coming, Todoroki fights the Makamou hard and faces the Douji-Hime's Fake Leader. They takes him to a holy land, the place to cleanse the Orochi. After Ibuki is chosen to perform the Orochi sealing, Todoroki tries to defeat some flying Makamou for Ibuki but it is fultie. Then Hibiki takes Ibuki's place and performs the Orochi sealing, Todoroki and Ibuki supports him. After the Orochi sealing, Todoroki goes back to work normally.