Fat Dragon is the undercover alias of kung-fu movie star Sammo Hung who is secretly a member of the Jouishishi faction stationed in Edo. He works as an Exam instructor for new recruits in the Jouishishi alongside Dragon Leader (aka Jackie Chan).
Fat Dragon/Sammo looks much like his real-life counterpart did during his youth and even has the same haircut. When going on undercover missions he wears a black full body suit.
- Like Dragon Leader's Hiroya Ishimaru, Fat Dragon's Voice actor: Mizushima Yuu, provides voice overs for Sammo Hung's various roles in his respective films.