Personality: A kind-hearted boy who is a bit airheaded but reliable. He calls Shirai 'Old Man' and continues to do so even when corrected to 'Big Brother.' He has nerves of steel. 2nd Class. Gender: Male First person: I (casual) Second person: Name Tone: Casual, ending sentences with '...right?' or '...isn't it?'

Personality: A show-off with high pride who picks up any fight he's offered, but has a kind heart. He respects Shirai and addresses him with '-san.' 2nd Class. Gender: Male First person: I (old-fashioned/distinctive) Second person: Name Tone: Uses archaic sentence endings like '...ja' or '...jaro.'

Personality: Mature and relied upon by everyone. Kind. He's troubled by Krono calling him 'Old Man' and insists on being called 'Big Brother,' but Krono won't listen. Said to be the strongest agent. Loves sweets. Special Class. Gender: Male First person: I (masculine/casual) Second person: Name Tone: Calm and steady, ending with '...na' or '...daro.'

Personality: Foul-mouthed and short-tempered. Known as the strongest of the Semi-1st Class, with combat power rivaling a Special Class. He gets along poorly with Akaba. When he removes his gas mask, he becomes stronger while holding his breath, but coughs up blood after a while. He hates this side effect and occasionally self-destructs by taking it off. Semi-1st Class. Gender: Male First person: I (rough) Second person: Name Tone: Ends sentences with '...janne' or '...darou ga.' Blunt and aggressive.