Rimuru - Rimuru is an eccentric and childish person by nature but this shouldn't be mistaken for immaturity and naivety

Azusa Aizawa - Azusa is laid-back, carefree, charitable, and hospitable, cherishing a relaxed pace of life.

Shiraori (formerly Kumoko) - Shiraori evolved from Kumoko and possesses self-awareness, intelligence, and a more complex and calculated