
Quick answer — Gorou Inagaki voices Ratchet Dr. in One Piece: Mega Mecha Soldier of Karakuri Castle, Masaaki Azumi in Children of the Sea.
Gorou Inagaki voices Ratchet Dr. (One Piece: Mega Mecha Soldier of Karakuri Castle), Masaaki Azumi (Children of the Sea).
Ratchet Dr. is voiced in Japanese by Gorou Inagaki.