Minatomo-san is a carpenter and a One PieceSBS joke character whom Oda invented to explain how the door to Partys Bar suddenly reappeared moments after Higuma had kicked it off its hinges.
According to Oda, Minatomo is a carpenter who cannot go past a broken door without repairing it. Since the answer was given, Minatomo has made several appearances in the anime, normally seen either randomly standing next to people or repairing doors. Minatomo's appearances are similar in idea to Pandaman and Sam.
Minatomo is a short, elderly man with tanned skin, dark gray hair, and a stern look on his face. He also has a scar on his left cheek. He wears working clothes in varying shades of blue and has a rope tied around his forehead.
Not much is known about his personality except that he is apparently short-tempered and cannot stand broken doors, immediately repairing them when he sees one. He appreciates talented carpenters as he praised Franky for his superior craftsmanship albeit in a rude and grumpy manner, much to the latter's annoyance.
Minatomo is an extremely skilled and experienced carpenter, since he could replace the door at Partys Bar in seconds without being seen. He owns his own carpenter guild which Franky is currently a new member of.