UAIt's about living without regret. That's what chivalry is to me!
Crimson Riot is a man with spiky, light-colored hair and he wears a mouth protection mask. He wears a light-colored outfit with a long collar and a cape.
Crimson Riot seems to be a hero with a very strong will who believes that willpower is more important than one's quirk, stating "As long as you got a manly spirit, then quirks don't count for nothing."
Crimson Riot is haunted by an incident early in his career where his momentary hesitation lead to civilian deaths. As a result of this traumatic experience, Crimson Riot became more fearful of watching innocent people die than of dying himself. Ironically, heroics fueled by this fear gave him a reputation as a fearless hero who always charged headfirst into danger without hesitation.
Crimson Riot is first mentioned when Class 1-A selects their hero names prior to choosing their first internships. Eijiro Kirishima chooses the name "Red Riot". Midnight notices the similarities between Eijiro and the Pro Hero, and Eijiro states that the name pays homage. He mentions that although he was old school, Crimson Riot was a man among heroes.