Debihamu-kun "Spat"

Spat is a strange, villainous hamster who appears in Hamtaro: Ham-Ham Heartbreak and some of the Japanese episodes. He is an evil, devilish hamster who attempts to destroy love. In comparison to most other characters, he has a unique appearance and personality. He says "pfpth" after most of his sentences (in the original version, "debi"). (Source: Hamtaro Wiki)