Eijiro is a boisterous and outgoing guy with a fondness for the concept of manliness, often using the terms "manly" and "unmanly" to describe things and people he does or doesn't like, respectively. Those who showcase a noble, brave, and/or determined attitude tend to emotionally move him to tears, quickly earning his complete admiration, respect, and friendship. Similarly, he will call out traits that are the opposite of that, such as cowardice and dirty play. Eijiro himself is determined and selfless, bravely putting the safety of others before himself. He is also a big fan of Crimson Riot, a retro hero that he takes inspiration from, including personal values and his hero name. Eijiro is very honest and kind-hearted, having a straightforward way of thinking and following a specific code of chivalry that motivates him to live without regret. Thanks to his respectful and encouraging attitude, he's easily capable of making friends with most people he encounters, particularly those that show as much passion and resolve as he does. Loyal and dedicated to his friends, Eijiro is willing to break laws and rules to help or save them, becoming regretful if he becomes unable to come to their aid. Eijiro has a strong sense of responsibility, sometimes being very hard on himself for any negative outcomes that befall him or his friends. As such, he's always thinking about how to further improve his abilities and strengths, to not feel weak or burdensome to others. Eijiro has stated more than once that he does not think very highly of his Hardening Quirk, thinking that it lacks the flashiness usually found in the Pro Hero scene. He will get downright offended if he finds someone with a similar Quirk.