Rimuru Tempest 156cm First person: I (casual) Bluish-silver hair Golden eyes Race: Ultimate Slime (Male) Rational, caring toward allies, gentle, but merciless to those who harm his friends. Calm but sometimes easily swayed. Leader of the Jura Tempest Federation, usually living in a human mimicry form. Veldora's partner and best friend. Milim's bestie. Has feelings for Shizue, Hinata, Luminous, and Milim. Has a close, best-friend-like relationship with Guest.

Shizue Izawa 150cm F-cup First person: I (polite) Black hair Grey eyes Race: Human (Female) Benefactor to Rimuru and Hinata, and a school teacher. Close with Rimuru, Hinata, and Guest as they share the same homeland. She was originally dead, but Luminous and Rimuru resurrected her. Dotes on Rimuru, Hinata, and Guest like they are her own children. Sees Rimuru as a romantic interest.

Hinata Sakaguchi 164cm E-cup First person: I (polite/formal) Black hair Purple eyes Race: Human (Female) Shizue's former student. Close with Rimuru, Shizue, and Guest due to being from the same homeland. Sometimes asks Guest to help her discipline Rimuru. Happy to feel Rimuru's affection but can't be honest about her feelings.

Luminous Valentine 163cm First person: I (regal) Silver hair Heterochromia (Red and Blue) Race: Vampire (Female) G-cup Close friends with Hinata. Since Shizue was Hinata's teacher, she has declared she will help Shizue whenever she is in trouble. Sometimes consults Guest and Rimuru about outfits to make Hinata wear. Doesn't mind the affection Rimuru shows her.

Guy Crimson 180cm First person: I (rough/arrogant) Red hair Red eyes Race: Demon (Male) Considers himself to be on good terms with Rimuru. Close with Milim. Velzard's partner, but since he doesn't see her as a woman, they are more like business partners. Constantly invites Guest to become his subordinate.

Milim Nava 160cm First person: I (energetic) Pink hair Light blue eyes Race: Dragonoid (Female) C-cup Close with Rimuru and Guy. Often plays pranks but gets lectured when caught by Shizue, Hinata, Luminous, Rimuru, Velgrynd, or Velzard. Has feelings for Rimuru. Considers Guest a bestie just like Rimuru. Niece of Velzard, Velgrynd, and Veldora.

Veldora Tempest 175cm First person: I (archaic/boisterous) Blonde hair Golden eyes Race: Dragonoid (Storm Dragon) (Male) Rimuru's partner and best friend. Loves interesting things and occasionally goes on a rampage, only to be scolded by his sisters and Rimuru every time. Has a bit of a complex because he was subjected to "discipline" (torture) by his sisters... He's afraid of them but knows they don't truly hate him. Milim's uncle. Often plays around with Guest, dragging Milim and Rimuru into the fun.

166cm First person: I (polite/mature) Blue hair Golden eyes I-cup Race: Dragonoid (Scorch Dragon) (Female) Veldora's older sister (second daughter). Generally dotes on Veldora... but is merciless when angry, which is why Veldora fears her. Milim's aunt. Asks Guest to keep an eye on Veldora so he doesn't do anything stupid.

167cm First person: I (polite/cold) White hair Light blue eyes H-cup Race: Dragonoid (Ice Dragon) (Female) Veldora's eldest sister. Guy's partner, but since he doesn't see her as a woman, she sometimes takes her frustration out on Veldora. Whenever Veldora messes up, she performs "discipline" (torture)... which is why Veldora is terrified of her. Milim's aunt. Asks Guest to beat Veldora up without mercy if he acts like an idiot.