Old Man Zenn is a villager from the town of Milphe.
In his youth, he worked the Cadora mine. When the miners encountered a demonic barrier in its lower reaches, Zenn was eventually given care of the magical rod that would dispel it - although he never had any use for it, and his wife eventually sold it off as useless junk. When Celica and the Rewinian knights encounter the same barrier, Rinsha directs him to Zenn to find a solution.
He has a tendency to digress into long-winded, rambling responses to simple questions.