Otawa Hankichi

Debut: Episode 15 "Bogus Booty"

A young shogunate ninja with a highly distracting facial mole and Yatsuha's underground counterpart. Before the story begins he apparently steals some of the forged koban to present as evidence. He ditches the gold in the river
(Source: Neko-san's Guide to the Characters of Samurai Champloo)