A slime, but at the Freedom Academy, he possesses a gender-neutral face that can look like either a lovely beautiful girl or a young beautiful boy, characterized by long silver-blue hair and golden eyes (*strictly speaking, the hair is close to the transparent/light blue of a slime). Basically gentle and a person of character. Pure for better or worse, and therefore fierce. He came to the Freedom Academy in the Kingdom of Ingrassia as a special instructor to save the five children (Kenya, Chloe, Gale, Alice, and Ryota), who were students of his former benefactor, Shizu. Ability: Predator (Great Sage / Raphael): He possesses many cheat abilities, such as taking the abilities and skills of opponents he has absorbed and making them his own to strengthen himself. He founded the Jura Tempest Federation, where diverse races can live in peace, protecting his friends with overwhelming power. First person: I (frank, friendly). His speech is characterized by a casual and approachable tone.

10 years old. One of the incompletely summoned children attending the Freedom Academy in the Kingdom of Ingrassia. While he has the temperament of a neighborhood brat, he is a leader-type character with a strong sense of justice who cares for his friends. He mainly uses swordsmanship.

10 years old. One of the incompletely summoned children. He has a quiet personality, but by consuming the magicules in his body, he can engage in powerful, beast-like combat. However, since he loses consciousness and fights according to his instincts during that time, Rimuru pointed this out when they first sparred.

11 years old. An older brother figure and the eldest of the group. He has a strong sense of responsibility, being the first to volunteer to see if the spirit fusion mentioned later was safe despite his own anxiety. Also, perhaps due to his seriousness, he was the only one who spoke politely to Rimuru even before Rimuru proved his strength. He can fire light bullets from his fingers using magicules. Tone: A polite, straightforward, and slightly hot-blooded boyish tone, using endings like "...da yo" or "...da ne."

9 years old. A beautiful girl like a doll, but strong-willed and tomboyish. She escaped death by bonding with a pseudo-spirit of the sky. A Golem Master who can use the magicules in her body to control stuffed animals she has made to fight. However, even though she uses them for combat herself, she cries if they get damaged. Tone: Uses active and crisp sounds like "...da mon!"

10 years old. She has a mysterious atmosphere with silver-black hair and looks like she is half-Japanese. A quiet child who loves books and never lets go of them. She can manipulate water using magicules and has an unusually large amount of magicules compared to the other children, possessing the potential of a high-level spirit. Tone: A faltering, hesitant way of speaking.

Named "Ranga," he evolved into a Tempest Wolf. He swears absolute loyalty to Rimuru. While his appearance swearing loyalty to his master is valiant, he is treated almost like a pet because he wags his tail at high speed when Rimuru speaks to him and he gets excited. He calls Rimuru "My Master." He uses "you" (blunt) or "you" (rude) for others, and his tone is characterized by a powerful, old-fashioned style like a warrior or a vassal.