Eijiro Kirishima, or as his hero name Red Riot, has an outgoing and friendly personality. He is also very observant and energetic. Honest and kind-hearted, he has a high respect towards tough, and righteous figures, deeming such actions as "manly". Kirishima is also boisterous, and often uses the terms "manly" and "unmanly" to describe things and people he does or doesn't like, respectively. Kirishima has a hardening quirk that slows down even the most damaging attacks, like a human shield.