This Is a Lead role

Maruo is an otaku who looks up to the protagonists of shonen manga and wishes to be one himself by living out intense battles. Initially, Maruo had given up on his dream after he came to realize that he was too strong to fight ordinary human beings, however, upon his firsthand experience fighting Ayashimon, Maruo managed to regain hope in fulfilling this path. He becomes extremely enthusiastic when he experiences anything manga related happening in reality and tries to live up to the part of a manga protagonist, such as naming his attacks. Maruo's hyperactivity and in need of guidance from his boss can make him be perceived as having a child-like personality.

Maruo possesses a love for fighting opponents who are a challenge for him and is very fearless. He also doesn't care if he gets seriously injured in the run, only finding pain thrilling and all the more reason for him to seek out strong people to do battle with. By his own admission, Maruo does not consider himself to be a masochist. A moral principle Maruo follows is that he does not fight anyone who has no intention of fighting back. However, he does not take it lightly when his opponents intentionally try to waste his time in the middle of battle.

Maruo is rather slow-witted, as he tends to experience brain overload when introduced to something new and complex. Since his only purpose in the Urara Family is to fight on Urara's behalf, Maruo does not bother to get in on the details to her plans, seeing himself as the muscle that simply follows the brain of the operation. However, due to his feeble-mind, Maruo does not use his head to compliment his brute strength in battle and performs actions that are illogical. During his fight with Nyudo, Maruo decided to use a steel door to block the Ayashimon's intense flames until he realized too late that the metal door conducts heat. To subdue his flames, Maruo jumped up towards the ceiling to destroy the hidden water pipes and cause a downpour instead of going off of Urara's suggestion in directing the flames upwards to set off the sprinklers.

Maruo has a sense of compassion to use his strength to defend others if he sees them in trouble, which is how he came to live his life as a yakuza after instinctively coming to Urara's rescue. Though he had no business in getting in between a dispute between two Ayashimon, Maruo could not sit idly by as one of them was being harassed and made the decision to defend him inspite of Urara's orders not to. However, Maruo is not without compensation for his good deeds, as he offered to help the harassed Ayashimon in exchange for his gang's office that Urara wanted.