“Heh. Looks like you've breathed your last!”
—Puzon
Puzon is the boss of the first gaiden chapter (in Eliwood's/Hector's story) in Fire Emblem: Rekka no Ken, Chapter 13x: The Peddler Merlinus. He is a Mercenary, hired by the bandits plaguing Caelin and appears to be the leader of a band of thugs who were accosting Merlinus prior to the chapter in an area just south of Caelin. You do not need to kill him to finish the chapter, as you only need to survive for the set number of turns. Yet, it is unknown what happens to Puzon when Merlinus is protected long enough.
Like many gaiden chapter bosses in Fire Emblem: Rekka no Ken, Puzon shares his sprite, but with a different color scheme. In this case it is with a nameless bandit from Chapter 6 that is killed by Rath.