Inosuke hashibira

Inosuke is short-tempered, confrontational, abrasive, and proud. He always likes to think he is the strongest fighter in a situation, constantly challenging most people he comes across and wanting others to respect and praise him for his skill. This often leads him into unnecessary danger since he tends to overestimate his abilities in comparison to who he's fighting and refuses to accept when he's been defeated, which can be seen when Giyu Tomioka has to tie him up after his fight with the Father to prevent him challenging the Hashira to a fight while still severely injured from his previous battle.[6] This constant wanting to be the best can also cause Inosuke to be very provocative, as he often tries to goad others, most prominently Tanjiro Kamado, into fighting him, although in the case of the latter he usually fails due to Tanjiro's obliviously kind nature.[7]Inosuke possesses a rather vengeful side to his personality, especially when the people he cares about get harmed. He refused to help the injured Train Engineer who stabbed Tanjiro and was convinced he was right in letting him die, only helping him when Tanjiro begged Inosuke to do so and forgave the man. He immediately attacked Doma upon learning he killed and devoured Shinobu, and he became truly angered when he found out Doma was also the one who orphaned him, challenging the Upper Moon by himself and declaring he would create hell for him. Most notably, he challenged Muzan directly and demanded he atone himself by dying for mutilating and nearly killing all the other Demon Slayers.

Due to him having been raised by boars, Inosuke has also been shown to possess little understanding of normal human interaction, at least at the time of his debut, as he seems to frequently assume that people who approach him want to attack him and doesn't appear to understand the kindness others show him.[8] He can't read or write and struggles to say people's names correctly, saying Monchiro instead of Tanjiro or Monitsu instead of Zenitsu. He can be very rude, without intention, and treat everyone as an enemy at first.

However, as the story goes on, Inosuke is influenced more and more by Tanjiro's ways and becomes more accustomed to affection and generosity, learning to also acknowledge the strength of people besides himself and develop feelings of friendship towards him and Zenitsu Agatsuma, although he does still retain his proud nature and constant desire for praise. He also begins to think more strategically when engaging in combat, using smarter tactics he has picked up from more experienced Demon Slayers and not just rushing into fights head-on without thinking. Inosuke's sense of camaraderie drastically improves, best evidenced when he lunges at Muzan Kibutsuji while mourning the scores of Demon Slayers killed and maimed by the Demon King and demanding he return everything he took from them or else die as retribution for his crimes.