Compared to his peers, Tetchō has a much more serious personality, though he still fits the bill as an eccentric fellow. For instance, he habitually combines similar-colored food and eats them. For example, he puts shichimi spice on strawberries, sugar on white rice, and sauce for noodles on yōkan. He is also shown to eat a hard-boiled egg with its shell still on, observe an ant colony for eight straight hours, and perform muscle training intermittently, even during meetings.