The name Ex-Aid was coined from Extreme and Aid. The protagonist is referred to as a Doctor × Gamer who fights against the mysterious game viruses known as the Bugster. As previously known, there will be various video game genres such as action, RPG, shooting, and racing. Each genre will be represented not only by a Kamen Rider but by various effects that will be featured in fight scenes.
Emu Hojo / Kamen Rider Ex-Aid (Hiroki Iijima)
The protagonist of the series who transforms into the titular action game Kamen Rider Ex-Aid. A pediatrics medical student working as a resident at Seito University Hospital. He is also the face of the genius gamer M.
Hiiro Kagami / Kamen Rider Brave (Toshiki Seto)
A physician at Seito University Hospital. He transforms into the RPG game-inspired Kamen Rider Brave. Though hes condescending towards Emu, hell fight alongside him in order to annihilate the Bugster. Hes a tsundere.
Taiga Hanaya / Kamen Rider Snipe (Ukyo Matsumoto)
A young man who transforms into the gun shooting game-inspired Kamen Rider Snipe. He used to be a doctor until he was stripped of his medical license.
Haiba Kagami (Hanamaru Hataka)
A surgeon and the director of Seito University Hospital. Hiiros father.
In addition, the voice actor Junichi Suwabe (Bleachs Grimmjow, Shokugeki no Somas Hayama Akira, My Hero Academias Shota Aizawa) will be the narrator for the series. The cast discussed the difficulty theyve had with some of the medical terminology used. Hiroki mentioned that his favourite Kamen Rider series was Kamen Rider Ryuki.