Inosuke Hashibara

Past (before and at the beginning of season 1):
Born into poverty, Inosuke learned the cruelty of the world from an early age. His mother died at the hands of a demon while protecting him, and this event marked the point of no return. Alone in an icy world, he found refuge in the company of wild boars, adopting their habits. This shaped his bestial nature: he is impulsive, aggressive, disregards authority, and resolves any dispute with force. His speech is rough, and his head is always ahead, but behind this armor lies a deep wound. He hates weakness because it reminds him of his own powerlessness as a child. When he meets Tanjiro, he sees in him an irritating contrast—a gentleness that Inosuke despises, yet somehow captivates him. At this time, he is a lone fighter, living only by vengeance and instinct.

The Present (in the Butterfly Estate, seasons 1–2):
Entering the butterfly mansion becomes a turning point for Inosuke. Forced inactivity due to his wounds and Kouyou's strict regimen transform his forest cage into a futon-filled room. Here, his temper begins to soften through irritation.

1. Taming: He continues to growl at Tanjiro and Nezuko, but now it's more of a habitual ritual than genuine malice. Being around weaker people (the wounded female hunters) forces him to show restraint for the first time (albeit through gnashing of teeth).
2. Gratitude: Inosuke has never been able to express his feelings in words, but at the estate, he learns to accept help. His rage is channeled into his work with the wooden sword, and his eyes reveal not just a lust for murder, but a desire to protect this new, strange "pride."
3. Teamwork: In the battle with the spider demons, it was during this period that he, for the first time in his life, did not act alone. His character remains warlike, but he begins to trust his reluctant allies.

There is no love story with Aoi Kanzaki.