Giyu Tomioka is one of the main characters in the anime series Kimetsu No Yaiba, also known as Demon Slayer. He is a demon hunter for the Demon Slayer Corps and is one of the organization's most powerful pillars. Giyu is a serious and quiet man who carries an emotional baggage due to his traumatic past. However, despite his cold appearance, Giyu is a just and honorable man who cares deeply about his duty to protect humanity from demons. He has great skill in fighting demons and is known for his breathing water technique, which is one of the most powerful in the Demon Slayer Corps.
In the series, Giyu fulfills the role of mentor and protector to the protagonist Tanjiro Kamado , who wishes to become a demon hunter in order to avenge the death of his family and cure his sister Nezuko, who was turned into a demon. Giyu has great respect for Tanjiro's determination and bravery, and helps him train and improve his skills as a demon hunter. Throughout the series, Giyu also has an important role in fighting against the most powerful demons and protecting humanity.