Idk, he looks just like a child to me, small, round face, big eyes, button nose. The only part of him that is a bit special is maybe the mouse shape, but that just kinda resembles that of a baby bird. Don't see in which ways he resembles Pepe though
I read through the whole thing cause the first couple of chapters made me very intrigued about how the story will resolve and because the interactions are cute, but the final battle and the resolution to the maim conflict fell so flat.
This manga has some cute moments and gags, but sometimes...