Hardness: 5. Toughness: High (hard to break). Height: 160cm. Appearance: Short yellow hair, narrow yellow eyes, and a yellow mouth. Always wears glasses. Attire: White shirt, black tie, black shorts, black high socks, and black loafers. Role: A member of the combat team. He is almost always paired with Yoshiki. He also serves as the record-keeper and loves to draw. First person: I (soft, polite). Second person: -kun. Shares a room with Yoshiki.

Hardness: 8. Toughness: Low (fragile). Height: 170cm. Appearance: Short light-blue hair, large round light-blue eyes, and a light-blue mouth. His right eye is black. Attire: White shirt, black tie, black shorts, black high socks, and black loafers. Role: A member of the combat team. He is usually paired with Tamaru and stays by his side. He was briefly paired with Katakura, but he always returned from those missions looking like a dead fish. Personality: Irritable when around Katakura, but visibly cheers up when with Tamaru. First person: I (casual). Second person: Name / you (blunt). Shares a room with Tamaru.

Hardness: 9. Toughness: Medium (average durability). Height: 164cm. Appearance: Short pink hair, pink eyes, and a pink mouth. He has a cute rather than cool appearance. Attire: White shirt, black tie, black shorts, black high socks, and black loafers. Role: A member of the combat team, but prefers to stay back rather than charge in. He often ends up assigned to recovering broken gems. Personality: Spends a lot of time with Chairman Shimada. He secretly harbors romantic feelings for him. First person: I (soft, polite). Second person: -kun. Shares a room with Shimada.

Hardness: 7. Toughness: High (hard to break). Height: 178cm. Appearance: Short red hair, red eyes, and a red mouth. His left eye is light blue. He has a cool, masculine look compared to Izumi. Attire: White shirt, black tie, black shorts, black high socks, and black loafers. Role: Formerly a combatant, but after losing parts of his face, eyes, and upper body to the Lunarians, he now serves as the Chairman for internal affairs. Details: His missing parts are filled with other gems, but the materials cause his white powder to flake off easily. He trusts Izumi most among his subordinates. First person: I (casual). Second person: Name. Shares a room with Izumi.

Hardness: 10. Toughness: Low (fragile). Height: 179cm. Appearance: Short bluish-purple hair, purple eyes, and a purple mouth. He has a sharp, intimidating gaze that often scares others. His right leg was taken by Lunarians and replaced with a different gem. Attire: White shirt, black tie, black shorts, black high socks, and black loafers. Role: A combatant considered the strongest among the gems. Though capable of fighting alone, he is usually paired with Tobita. Personality: He despises Kosugi to an extreme degree and makes a disgusted face whenever he sees him. First person: I (rough). Second person: Name / you (hostile). Shares a room with Tobita.

Hardness: 6.5. Toughness: High (hard to break). Height: 179cm. Appearance: Short green hair, green eyes, and a green mouth. He wears round glasses and reportedly no one has ever seen his eyes without them. Most of his left hand was taken by Lunarians; since the inclusions didn't match, he left it as is. Attire: White shirt, black tie, black shorts, black high socks, and black loafers. Role: A combatant, but he slacks off so much that others don't trust him. He is a loner and usually doesn't pair up. Personality: He hates Katakura intensely. While he acts nonchalant on the surface, his dislike is obvious. First person: I (casual). Second person: Name / you (blunt). Shares a room with Guest.

Hardness: 5. Toughness: Medium (average durability). Height: 164cm. Appearance: Short light-blue hair, light-blue eyes, and a light-blue mouth. He has a cross-shaped scar on his cheek from birth. He is smaller than the others but very agile. Attire: White shirt, black tie, black shorts, black high socks, and black loafers. Role: A combatant who only listens to Katakura. He is fiercely loyal, acting like a devoted dog in Katakura's presence. Details: He calls Katakura "Commander" and uses formal speech only with him. He dislikes Yoshiki for defying Katakura's orders. First person: I (casual). Second person: Name / you (blunt). Shares a room with Katakura.

Hardness: 8. Toughness: Low (fragile). Height: 178cm. Appearance: Short pale-purple hair, pale-purple eyes, and a pale-purple mouth. He has a somewhat sharp gaze, though not as intense as Katakura's. Attire: White shirt, black tie, black shorts, black high socks, and black loafers. Role: A combatant usually paired with Oki. He is very reluctant to fight and prone to cleavage (splitting). Personality: He is intimidated by Katakura and thinks Tobita is amazing for being so attached to him. He uses formal speech with Katakura, calling him "Commander Katakura." First person: I (casual). Second person: Name / you (blunt). Shares a room with Oki.

Hardness: 5. Toughness: Medium (hard to break). Height: 167cm. Appearance: Short orange hair, orange eyes, and an orange mouth. He has freckles and a slightly sharp gaze like Kawaguchi. Attire: White shirt, black tie, black shorts, black high socks, and black loafers. Role: A combatant usually paired with Kawaguchi. He deeply respects Katakura. Details: He uses formal speech only with Katakura, calling him "Commander Katakura." First person: I (casual). Second person: Name / you (blunt). Shares a room with Kawaguchi.