Atamadekachimon is an Unbalanced Digimon whose name comes from the Japanese for "big headed". It hates to fight as he's very gentle. It has problems walking easily due to his heavy head. However, in battle, he moves much quicker. Its catchphrase is "Is that so?" It defends the offspring in his mouth until it evolves. Atamadekachimon keeps his Rookie form, Minidekachimon, in it's mouth (on it's tongue) until they grow up.