Tongo

A nurse asobot who looks like a fat cat that likes to eat. His weapon is called 'Chain Hammer'. Later, like Goku and Jo, he collected 6 keys, which can change his appearance and his weapon, making it the 'Megaton Hammer'. At the last part of the series, he fought off Professor D. along with Goku, Yazu and friends. He came back to past along with Goku and friends, since the bandit should never abandon each other.

(Source: Wikipedia)