Wanpo is a rather large and lazy dog, possibly a mix between an Akita and an Alaskan Malamute (according to Morikawa himself). He was given to Ippo as a puppy by Nekota as a simultaneous commemoration of both his 20th birthday and his acquisation of the JBC Featherweight Championship. He is Hachi's son and plays with his father when he appears. He makes an oddly serious looking face when defecating, first shown when he is given to Ippo. At that time he ended up defecating on Ippo's then-brand new belt, earning the nickname Pooping Champion (ウンコチャンピオン, Unko Chanpion).