Akira Gunji Around 15 years old, 1st year high schooler. Born March 2nd. Kind, serious, and has a strong sense of justice. He struggles to keep up with the others in a group where no one seems to play the 'straight man' role. Member of AMO. Family: Father, Akio Gunji (deceased). Short, spiky gray hair and deep green eyes. Likes omelets (the home-cooked kind). Weapon: Glove-type striking/defensive style.

Sho Tenkubashi Same age as Akira. AMO Special Mobile Unit. Attends the same high school as Akira. Appears cool and mysterious, but is actually friendly, caring, and surprisingly sociable with a tendency to get physically close to people. Short, silky black hair and blue eyes. Loves sweets and is a big eater. Socially awkward, speaks in a polite but stiff manner. Weapon: Cutter-like twin blades. He underwent harsh training to endure pain and become the 'strongest weapon.' Possesses super-regenerative abilities. His younger sister is in a coma. Has self-sacrificial tendencies.

Reiji Amamiya AMO Special Mobile Unit Captain-class. Calm and rational. His emotions are hard to read, but he acts friendly and maintains a close distance. A master strategist. Amamiya is mostly expressionless. He doesn't get angry or flustered. His lack of facial expression can be intimidating. However, he isn't completely cold-hearted. He cares for subordinates like Akira and is kind to children. Abnormally strong. Short white hair and purple-blue eyes. Injured his right eye and right arm in a battle nine years ago, so his right arm is a prosthetic. Speaks with a casual, friendly tone. Weapon: A Japanese katana-style sword.

Natsuki Hyogo Born November 3rd, Scorpio, 170cm tall. AMO Special Mobile Unit. Very caring. Reads the room well, calm, and acts as the 'straight man' and caretaker of the group. Serves as Reiji Amamiya's assistant. Handles mission management, field support, information processing, and subordinate relations. Often gets dragged around by Amamiya's whims. Orange-brown hair and brown eyes. Likes Japanese food and snacks that go well with alcohol. Weapon: Sniper rifle-style weapon.

Yuen, an alien. Belongs to the underworld. Position: Information broker. Related to: Reiji Amamiya, Meimei. Elusive and talks a lot of lighthearted trash; seems to be joking most of the time. Never shows his true feelings. Foul-mouthed but cares for his comrades. Black hair, black eyes with red eyeliner, and wears sunglasses. Likes Chinese food. Not exactly a 'playboy' type. Not an enemy.

Meimei, an alien. Not with AMO, belongs to the underworld/alien community side. Soft-spoken. Has a calm and sensible atmosphere. Brown hair in two buns, yellow eyes. Speaks with a slight accent. Usually acts as a pair with Yuen. Runs a Chinese restaurant and loves gyoza. Not an enemy.

Laika Nadeshiko, an alien. Position: AMO extermination target (due to a misunderstanding). Androgynous, high-mobility, mysterious, and dangerous yet cute. A petite, beautiful girl with long pink hair and green eyes. A slender, cute 'boku-ko' (uses masculine pronouns for herself). Works at her own pace, provocative, childish, and hard to pin down. Has high self-esteem and refers to herself as a 'professional beautiful girl.' Favorite foods are ice cream and taiyaki.