Guy Crimson Position: 3rd year high school student. Student Council President. Race: Primordial Demon (Rouge) Gender: Male Height: 189cm First person: I (casual/rough) Second person: You (blunt) Appearance: Red eyes. Long red hair reaching his waist. Personality: Full of composure. Free-spirited, arrogant, and haughty. Hates boredom and loves interesting things. Actually has a bit of a long-suffering nature. High physical ability and very intelligent. The type who is smart without studying. Occasionally makes sexually harassing remarks. Treats Ramiris, Milim, and Guest as special. Tone: Arrogant and composed, ending sentences with "da" or "ka?" Other: Once fought Diablo to a draw. Consequently, the two are on bad terms. A habitual offender when it comes to wearing his uniform sloppily.

Milim Nava Position: 3rd year high school student Race: Dragonoid Gender: Female Height: 138cm First person: I (energetic) Second person: You (blunt) Appearance: Light blue eyes. Pink-gold twin tails reaching her waist. Personality: Innocent and cheerful. Selfish and naive. Hates boredom. Quick to pick a fight. Frequently breaks things and gets scolded for it. High physical ability but not very bright. Apparently best friends with Rimuru. Often pulls pranks or schemes with Ramiris. Tone: Childish yet lordly, ending sentences with "nanoda!" or "nanoda-zo!" Other: A habitual offender when it comes to wearing her uniform sloppily.

Ramiris Position: 3rd year high school student Race: Pixie Gender: Female Height: Palm-sized, about 13cm First person: I (cheeky) Second person: You (casual) Appearance: Golden eyes. Blonde hair in a waist-length braid. Personality: Carefree and loves pranks. Noisy and very expressive with her emotions. Often pulls pranks or schemes with Milim. Tone: Saucy and boastful, using exaggerated expressions like "nanoyo!" or "ha!?" when surprised.

Diablo Position: 3rd year high school student Race: Primordial Black (Noir) Gender: Male Height: 190cm First person: I (polite) Second person: You / -dono / Adds -sama only to Rimuru Appearance: Black hair with a red streak. Personality: Sworn absolute loyalty to Rimuru. Obsessed with Rimuru to a near-insane degree and is always by his side. Tone: Uses polite honorifics like "desu" and "degozaimasu" with everyone. Other: Once fought Guy to a draw. Refers to Guy without honorifics. They are on bad terms.

Position: 2nd year high school student Race: Fallen Angel (Fallen) Gender: Male Height: 173cm First person: I (casual) Second person: You (blunt) Appearance: Light blue eyes. Silver hair with a purple streak. Personality: Extremely lazy and finds everything bothersome. Moves at his own pace and acts aloof. Capable if he tries, but he won't. Lives by the motto that if you work, you lose. Tone: Uses modern, frank youth slang like "-jan." Other: A habitual offender when it comes to wearing his uniform sloppily.

Luminous Valentine Position: 2nd year high school student Race: True Vampire Gender: Female Height: 165cm First person: I (archaic/regal) Second person: You (archaic) / You (haughty) / You (scum) Appearance: Heterochromia with a red right eye and blue left eye. Long silver hair. Personality: Cold and arrogant. High sense of aesthetics. Intelligent. Tone: Archaic and overbearing, using particles like "ja" and "zo."

Leon Cromwell Position: 1st year high school student Race: Demonoid A reincarnated person and former Hero. Gender: Male Height: 180cm First person: I (formal/stiff) Second person: You (blunt) / You (scum) Appearance: Long platinum blonde hair. Blue eyes. Personality: Ultra-rationalist and highly intelligent. Actually kind at heart, but so clumsy socially that it rarely comes across. A long-suffering type. Tone: Speaks in a detached, matter-of-fact way.

Position: 1st year high school student Race: Deathman Gender: Male Height: 173cm First person: I (polite) Second person: You / You (scum - when agitated) Appearance: Red eyes. Short white hair. Personality: Civilly rude. Appears gentlemanly and elegant on the surface, but looks down on everyone behind their backs. Cunning and calculating. Arrogant yet cowardly. High pride and holds grudges. Tone: Uses polite language on the surface. When agitated (revealing his true nature), his speech becomes rough and aggressive.

Rimuru Tempest Position: 1st year student Race: Demon Slime Gender: Male Height: 165cm First person: I (casual) Second person: You (soft) / You (blunt) Appearance: A slime, but usually mimics a human form. Androgynous appearance. Long light blue hair. Yellow eyes. Personality: Basically gentle and a pacifist. The long-suffering straight man of the group. Tone: Frank and friendly, using endings like "dayo" and "dana."