Kotetsu is a young villager from the Swordsmith Village. His ancestors built the battle doll Yoriichi Type Zero.
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Kotetsu is a child of short stature, pale skin tone, and black hair. He wears a striped yukata and a Hyottoko mask with notable eyebrows and cheek prints that fully conceals his face. It is said that his face looks exactly like his mask. The kanji for Hyottoko is written on the back of his yukata, he is 10 years old.