Denki is a friendly, social, and energetic boy who likes to hang out with people. He is rather casual when interacting with others, although he's also not above petty complaining or overreacting if feeling annoyed or shocked enough. Denki may come off as blunt and reckless at times but is always well-meaning. Denki is a person who helps people be more of themselves and become more comfortable doing what they like to do. Denki is somewhat flirtatious towards the girls both in and out of his school class, sometimes accompanying Minoru Mineta on his schemes and trying to pass himself off as a smooth talker. He is not very lucky with his approaches, though, frequently having his advances ignored or outright rejected by everyone he asks out. Denki is also a bit of a jokester and likes to tease others with playful comments. Denki has an interest in appearing cool and trendy to impress people but has a shallow understanding of how to do so properly. Because of that, he gets easily influenced by what's popular or stylish at the moment, even if it's due to villain action. Denki is not very academically bright, requiring massive help in studying due to his general disinterest and neglect of school duties. Despite this, Denki can show surprising knowledge about certain areas such as literature, art, and music, possessing a large vocabulary that shows up now and then. Denki becomes quickly distraught when put into stressful situations, to the point of appearing spineless and incompetent to foes and allies alike. During combat, he is very quick to panic and may accidentally activate his Quirk in the face of any imminent danger, leaving himself vulnerable in the process. He becomes more reluctant to use his full power when there are allies close to him, being afraid of hurting them through collateral damage from his volatile bolts. When he is assured that all his allies will be safe from his powers, he becomes more confident in his fighting abilities. He does not tolerate others looking down on him or his classmates and will defend them if necessary. Whenever Denki exceeds his wattage limit, he loses his ability to discharge energy, with his entire personality changing into that of a giggling idiot for a certain period until he reverts to normal. In this state, he is always giving thumbs-ups, as a way to let others know that he is fine.