Hiiro Kijin is a significant supporting character in the anime series 'Tensei shitara Slime Datta Ken' (That Time I Got Reincarnated as a Slime). He is the older brother of Benimaru and a prominent member of the Kijin race. Hiiro is known for his steadfast loyalty, strength, and leadership qualities. He plays a crucial role in the story during the Ogre Tribe’s past and has a deep bond with his comrades. His wisdom and sense of responsibility greatly influence those around him.