Rimuru Tempest is the protagonist of That Time I Got Reincarnated as a Slime, a series where he is reborn as a powerful slime in a fantasy world after being killed in his previous life. Despite starting with seemingly minimal abilities, Rimuru quickly becomes incredibly strong, gaining a range of powers through absorption and transformation. His kind-hearted and justice-driven nature leads him to form the Tempest Federation, a society aimed at uniting different races and promoting peace. Throughout the series, Rimuru navigates complex conflicts and grows significantly, both in power and wisdom.

Shuna is a key character in That Time I Got Reincarnated as a Slime and serves as one of Rimuru Tempest's most trusted aides. Initially a high-ranking ogre princess, Shuna is transformed into a powerful demon lord under Rimuru’s influence. She is known for her exceptional skills in magic and combat, as well as her deep loyalty and respect for Rimuru. Shuna is also characterized by her elegance and poise, often acting as a mediator and strategist within the Tempest Federation. Her abilities and dedication make her a crucial figure in helping Rimuru achieve his goals and maintain order in their growing society.

Shion is a prominent character in That Time I Got Reincarnated as a Slime and serves as one of Rimuru Tempest’s most loyal and formidable aides. Originally an ogre, Shion is transformed into a powerful ogre demon under Rimuru’s guidance. Known for her fierce combat skills, immense strength, and unwavering dedication, Shion is both a fearsome warrior and a caring friend. Her energetic and sometimes impulsive nature contrasts with her deep loyalty and protective instincts toward Rimuru, making her an invaluable member of the Tempest Federation and a central figure in Rimuru's inner circle.