Grandpa (じっちゃん, Ji-chan) is a character from the Hamtaro franchise. He first appeared in Hamuchanzu de Gozaimachu! Vol.1 as the grandfather of Akun and owner of the Ham-Hams. He returned in the anime series as Mindy O'Hara's grandfather. Originally running a pet shop, he is very good with animals. He found Lapis and Lazuli in a desert and gave them to Mindy as pets.
- While his name literally just translates to "Grandpa", it is written in a way that would only be stated by a child, and not a grown adult.