Giyuu Tomioka

Tomioka Giyū) is a major supporting character in the popular anime/manga series Demon Slayer: Kimetsu no Yaiba. He is a member of the Demon Slayer Corps and the current Water Hashira who is also the one who enlisted Tanjiro Kamado into a Demon Slayer.

Giyu has a reserved personality and a strong sense of justice with no tolerance towards those who don't know their own limitations and throw away their lives. While letting Nezuko Kamado live due to Tanjiro Kamado's persistence, he shows zero hesitation when killing other Demons and has no respect towards them like most Demon Slayers. Even so, Giyu violated the Demon Slayer Corps' code of conduct without hesitation to protect Nezuko, during Shinobu Kocho's attempt to kill her. This implies that he doesn't completely despise Demons as some other Hashira do, and is willing to make an exception for a Demon by letting them live if they don't kill and eat humans. This shows that he is more pragmatic in dealing with Demons rather than out of hatred for Demons like some other Hashira do.

Giyu appears to have a complex with what others think of him and is shocked when Shinobu claims he is hated by many.

He is a man of very few words and has trouble interacting with others, so he usually keeps himself at a distance. It is revealed later on that Giyu suffers from an inferiority complex which he developed since his participation in the Final Selection. It gets severe to the point where he contemplates abandoning his position as the Water Hashira until Tanjiro helps him realize that instead of acting on his survivor's guilt, he should cherish his life and live on for the people who sacrificed their lives f or him.

Giyu developed a hatred for Demons after one of them killed his sister Tsutako and no one believed him. To avenge her, Giyu took up Water Breathing training under Sakonji Urokodaki alongside Sabito and Makomo.

Due to his horrific punishment, he gets panic attacks from seeing anything that resembles a worm. This does include butterflies and snakes, both because of their bodies, but also because it reminds him of Shinobu (butterflies) or Obanai (snakes.) He’s mentally weak and probably easy to manipulate. He wants comfort and to forget about the horrible punishment more than anything. He also has horrific nightmares about the incident, often ending with him waking up screaming, sweating, and in a puddle of his own piss from fear.

Giyu developed a hatred for Demons after one of them killed his sister Tsutako and no one believed him, even ruling him as mentally ill. To avenge her, Giyu took up Water Breathing training under Sakonji Urokodaki alongside Sabito and Makomo.

Giyu is the current Water Hashira as well as the first Demon Slayer that Tanjiro Kamado comes across as he initially tries to kill Nezuko Kamado, but reconsiders after seeing her protect an unconscious Tanjiro as he sends them to his mentor Sakonji Urokodaki in the hopes that Tanjiro could succeed him and possibly cure Nezuko. He does not think of himself as a true Hashira, despite mastering Water Breathing as he considered his fellow apprentice Sabito, who died saving other Demon Slayers-in-training, more suited for the role. He has developed an additional technique to Water Breathing, which he alone knows.

His trauma leads to an easily scared crybaby persona, almost like a small child. All he wants is someone to love him.. someone to comfort him… he misses his sister, he misses his best friend named Sabito. If they were still alive, this wouldn’t have happened..