C-robot

A robot sidekick created by Tanpei, it can appear pretty childish in both appearance and actions, but it is not always a hindrance. Its power source is the winding key protruding from its back. Its features include also a flamethrower built into its nose, extendable limbs, and an ability to shock others with a significant amount of voltage output. (Although a robot, it is seen briefly eating cream puffs in the second episode.)

(Source: Wikipedia)