Info: Garappachi first appeared in the chapter “Kuroi Kumo to Shiroi Hane” (Black Cloud and White Feather) as well as also the pilot episode. He meets Unico and allows him to come stay with him and his family. Garappachi also shows Unico to the sickly girl named Chiko.
Garappachi doesn’t have a name in the pilot episode. He is simply a nezumi (mouse). Garappachi also has a wife in the manga which does not appear in the pilot.