Seki: Seki is tough, indifferent, cold and blunt being exposed to life's harsh realities at a young age, he is protective of Shimizu. Seki is untrusting, reserved and impassive to most things and self-serving.
Shimizu: Shimizu is playful, light-hearted person. He's gullible, naive, easily manipulated and has a lack of independence, relying on Seki mostly. Shimizu has an overactive imagination and a childish innocence though is often quiet, letting Seki speak.They’re both kids.