Giyuu Tomioka

Giyu is a man of strong equanimity, always wearing a calm and stern expression on his face. Having a stoic personality, and possessing a very strong sense of justice and responsibility, he had no tolerance towards those who don't know their own limitations and throw away their lives. Despite letting Nezuko Kamado live due to Tanjiro Kamado's determination, he shows zero hesitation when killing other demons and has no respect or mercy towards them like most Demon Slayers. Even so, Giyu violated the Demon Slayer Corps' code of conduct without hesitation to protect Nezuko during Shinobu'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 and impartial in dealing with demons rather letting his hatred cloud his judgement.

Due to his aloof personality, Giyu is not close to his fellow Hashira. While some are on even terms but emotionally distant from him, others view him with apathy, or even disdain; Sanemi Shinazugawa and Obanai Iguro were particularly contemptuous of the Water Hashira due to unfoundedly misreading his aloofness as arrogance. Giyu also expressed surprise when Shinobu Kocho mentioned that he is hated by the others; despite this, he remains on good terms with her, with both having a great deal of history together. In the end, after defeating Muzan Kibutsuji, he ended up developing a closer friendship with both Tengen Uzui, and his former rival Sanemi.

He is of very few words and isn't very good interacting with others, choosing to observe from a distance quietly.He even goes out of his way to tell Akaza that he hates talking and wants to keep his name to himself, as he thinks names are not meant to be shared, especially to demons. He could also be quite sardonic as shown when he frankly berates Inosuke Hashibira for mistaking Father as a member of the Twelve Kizuki, and sarcastically insulting Sanemi for complaining that the way to achieve a Demon Slayer Mark was simple. However his quiet behavior could become a detriment to Giyu's reputation, as the Water Hashira did not explain his deeper emotional feelings with his colleagues, and uncooperatively declined explaining his reasoning to not particpate in Hashira Training, angering Sanemi and Obanai, and even causing his closest ally Shinobu to ask Giyu to explain himself.