Tonkichi's personality is almost entirely represented by the Mr. Dodo persona. He can be shown to be serious when focused on work for the Bureau, but large portions of his job are entertaining young guests while waiting for the various park rides to be assembled. He frequently squawks and jumps around rapidly as part of this persona, which puts many guests at unease. Children sometimes call for Mr. Dodo and Tonkichi is happy to oblige them regardless of the opinions of his Bureau coworkers.

Tonkichi has an eccentric, high-pitched voice.