Fumikage is reserved, serious, and focused, albeit noble and valiant as well. Though he does not talk very much, he will directly ignore questions or requests that seem in some way pointless (like Tenya asking him to not sit on the desk) while he talks to other people as some sort of ongoing joke. When Fumikage teams up with others, he becomes more sociable, helping his teammates out, reassuring his trust in them and thanking them for their effort.

Fumikage is fond of darkness and other related concepts, considering himself a "creature of the dark" and employing archaic-sounding speeches that end up painting him as slightly dramatic. Still, Fumikage is a bit insecure about his interests due to them being more on the arcane, fantastical side, and thus harder for others to understand or relate to.

Fumikage is aware of his own limits and understands when it's time to back down, surrendering when Katsuki Bakugo forced him into a difficult position to fight back. He takes any advice he gets seriously and uses it to try and improve on his Quirk and abilities. Fumikage seems to hold a certain level of belief in the concept of fate, and thinks little about fame and idolatry, but is still prideful enough to not tolerate being looked down.