Giyu Tomioka is one of the main characters of the anime series Kimetsu No Yaiba, also known as Demon Slayer. He is a demon hunter of the Demon Slayer Corps and is one of the most powerful pillars of the organization. Giyu is a serious and quiet man who carries an emotional burden 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 water breathing technique, which is one of the most powerful in the Demon Slayer Corps.
In the series, Giyu plays the role of mentor and protector of the protagonist Tanjiro Kamado, who wishes to become a demon hunter to avenge the death of his family and cure his sister Nezuko, who became 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 plays an important role in fighting the most powerful demons and protecting humanity.