Chubby Deviltchi has a large, round head with red ears. It has a large, red body with stubby arms and feet. Its eyes are slanted and always closed, and it has a wide mouth.
Because of its size, it's speculated to somehow be related to Chubby Angel, which it considers its rival. It gets nervous whenever it hears that Chubby Angel is dieting. It has a large tongue, and it eats at its own pace. Professor Banzo suspects that Chubby Deviltchi was Nyatchi in its previous life.
On Virtual Pets
Debirutch no Tamagotch
Its Japanese name comes from the phrase "pukupuku" which means "swelling/swollen".