Bunyan is a character in Breath of Fire IV. He is both a Non-Playable Character who plays a pivotal role in Fou-Lu's storyline, as well as a master that the party can learn abilities from. Another version of the character previously appeared as a master in Breath of Fire III.
Bunyan discovers Fou-Lu collapsed by a river, injured with severe burns from his first confrontation with Yohm, and brings him to his home in the Zhinga Mountains where he cares for him until he regains his strength. This parallels his role in Breath of Fire III, where that games version of the character nurses Ryu back to health.
Shortly before Fou-Lu leaves, Bunyan states that he senses a big fight coming and asks if there will be another war, having deduced that Fou-Lu is on the run. Bunyan also reveals that he was once a soldier and, perhaps because of his age, now views his previous battles as pointless.