Haruka Iseumi

Haruka seems to be benevolent and prideful on a surface level; he has a habit of constantly introducing himself in an extravagant manner and he holds his position as president of both the student council and the Devil Hunter Club in high regard. As of such, he tends to lead those around him, instructing others on how to handle a situation, utilizing their skillset to their advantage. However, he can also be very demeaning to those he views as having no worth to the club, such as when he berates Asa for accidentally destroying her phone when she tried to help out. It's also shown that he can be fairly manipulative, lying to others that he is indeed the real Chainsaw Man, likely in order to boost his own popularity. However, when cornered in the aquarium he easily admits that his ripcord is simply a surgical implant and reveals himself to simply be a massive fan of the Chainsaw Man. Haruka doesn't seem exceptionally brave. When cornered in the aquarium he breaks down screaming for Chainsaw Man to save him, he is later also shown to be easily intimidated by others. His devotion to Chainsaw Man is shown to be the main cause as to why he co-lead the Chainsaw Man Church as its "face," as he didn't have the same ulterior motives held by Barem and "Fami". In fact, their plan involving the Fire Devil is shown to take a mental toll on him, and he swears to never get involved with Fami or her plans ever again. However, his devotion to Chainsaw Man immediately lead to him turning back on this vow and he decides to venture further into danger just for the chance of meeting him.

Haruka is a slim young man who wears a bandana, an all-black uniform, and a military cap with a symbol. He has black hair combed to the side of his face. He has a pull cord in his chest identical to that of Pochita's in Denji's chest, later revealed to be a surgical implant.