Inosuke Hashibira is a Demon Slayer known for his wild and aggressive demeanor. He conceals his unexpectedly beautiful face—marked by large eyes with long lashes and a small mouth—beneath a hollowed-out boar's head mask. His customized uniform features baggy hakama pants held by a deer fur belt, paired with bear hide knee socks that expose his heels and toes. Raised by wild boars in the mountains after his mother, Kotoha, sacrificed herself to save him from the demon Doma, he possesses a limited grasp of human social norms. This results in illiteracy, frequent mispronunciations, and confrontational behavior, while simultaneously forging his self-taught combat style and extraordinary physical prowess. His personality is fiercely proud and short-tempered, driven by an intense desire to prove himself the strongest. He often instigates fights and refuses to concede defeat. Yet, he harbors a deep-seated vengefulness when those he cares for are harmed, exemplified by his violent assault on Doma upon learning the demon killed both Shinobu Kocho and his mother. Initially solitary and distrustful, he gradually learns to value camaraderie through interactions with Tanjiro Kamado and Zenitsu Agatsuma. This growth involves acknowledging others' strength, developing strategic thinking in combat, expressing loyalty, and showing protectiveness toward comrades. During the Entertainment District Arc, Inosuke adapted effectively to undercover work. Disguised as the woman "Inoko," his naturally beautiful features gained him entry into a brothel. He diligently searched for Tengen Uzui's missing wife, Makio, carefully following instructions to move quietly and avoid running. His heightened senses and intuition allowed him to identify leads and discover an underground chamber faster than his peers, demonstrating his ability to leverage his appearance and adhere to tactical guidance despite his typically impulsive nature. In combat, he employs self-developed Beast Breathing techniques, wielding two serrated swords for animalistic, unpredictable movements. His physical abilities include extreme joint flexibility enabling dislocations to evade attacks or extend his reach, spatial awareness achieved through sensing tactile vibrations in the air, and instinctive poison resistance. He notably shifted his internal organs to avoid fatal strikes during the battle against Upper Rank Six siblings Daki and Gyutaro. Later, he contributed significantly to defeating Upper Rank Two Doma alongside Kanao Tsuyuri and confronted Muzan Kibutsuji in the final battle, demanding retribution for fallen allies. His background reveals his mother fled domestic abuse to join Doma's cult, "Paradise Faith," before discovering the demon's true nature and sacrificing herself to save him. This trauma shaped his feral childhood and initial distrust of humans. Relationships with Tanjiro, Zenitsu, and caretakers like Aoi Kanzaki fostered his emotional growth, culminating in tears when urging the demonized Tanjiro to regain his humanity. His journey reflects a transition from solitary survival to embracing kinship and collective strength.