Inosuke Hashibira/Relationships

Tanjiro Kamado
Inosuke sees Tanjiro as a rival due to him enjoying competing with stronger opponents. Over the months that they spent together, Tanjiro seemed to have a positive effect on Inosuke as ever since meeting Tanjiro, Inosuke has been more open-minded about how others are strong, hence the pillars. Inosuke also developed his ability to think and analyse the opponent's powers and skills.

Zenitsu Agatsuma
The two don't always get along due to their vastly different personalities as Inosuke is always ready for a fight and Zenitsu tends to be cowardly and prefers not jumping head first. Despite this, the two have managed to team up against powerful Demons such as when they fought together against Daki and Gyutaro.

Shinobu Kocho
Kocho quickly learns to manipulate Zenitsu in a similar fashion to Tanjiro, figuring out that she can convince him to undertake any task by second-guessing his ability to do so. Inosuke initially shows his usual abrasive and disrespectful attitude towards Kocho, going so far as to threaten to rip her breasts off when he feels insulted by this second-guessing. However, it becomes clear that after she cared for him in his injured state, Inosuke harbored affection for Kocho, vowing to avenge her death when he learned that Doma absorbed her. Kocho's sweet demeanor and use of a "pinky promise" with Inosuke inadvertently recalled deep subconscious memories of his mother.

Kanao Tsuyuri
Inosuke has fairly minimal interaction with the detached Kanao during their training, but the two later form a battle-forged bond while teaming up against Doma, who was responsible for the deaths of both of their loved ones. The pair make for an effective team in combat, and with help from Kocho's poison they manage to slay one of the most powerful demons in the series together, despite neither even being a pillar. Afterward, though they exchange no dialogue, they share a moment to grieve the families they both lost to Doma.

Kyojuro Rengoku
Like Tanjiro and Zenitsu, Inosuke is immediately taken with the strong and magnanimous Kyojuro, looking up to him as a mentor and leader after they meet on the Infinity Train. After Kyojuro's death against Akaza, Tanjiro and Zenitsu despair, while Inosuke is the one to pick them up, correctly voicing that Kyojuro would want them to keep fighting and live great lives to honor his memory and sacrifice.

Gyomei Himejima
During pillar training, Inosuke revels in the final phase of endurance testing under Himejima, pushing himself to the point of falling unconscious while remaining on his feet under a freezing waterfall. Inosuke immediately admires Himejima for his incredible strength, identifying him as the strongest pillar.

Doma
Inosuke only interacts with Doma for the duration of their battle, but rapidly develops a deeply personal hatred and desire for vengeance against him. This starts when he finds out Doma absorbed Kocho, and takes on a whole new dimension when he finds out that Doma orphaned him and devoured his mother when Inosuke was an infant. For his part, Doma is intrigued by Inosuke's attitude and fighting style, and underestimates him entirely as an opponent.

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Иносукэ Хашибира