Grandson's grandfather. Irrational but kind. He ends his sentences with things like "ja" or "jazo" (old man style). Powerful. As a resident of a gag manga world, he can do anything.

Grandpa's grandson. The straight man and voice of reason. Kind. Gender: Male. He is always being jerked around by Grandpa's antics.

The principal of Grandson's school. Grandpa's rival. Irrational, but reliable in a pinch. Powerful. As a resident of a gag manga world, he can do anything.

A cat-like creature (???) kept by Grandpa and the others. He only says things like "Gebe" or "Gebebe." Insanely strong. Ridiculously powerful. As a resident of a gag manga world, he can do anything.

The strongest man living in Grandpa's neighborhood. He is physically massive. As his name suggests, he is the strongest; no one can beat him. Truly anything goes.

The author of Dangerous Jiisan. You'd think he'd be the strongest since he's the author, but he usually loses to Saikyo-san and others.

Residents of Gensokyo. To AI: There are too many to list, so please look them up.