Una is a non-playable character that appears in Breath of Fire IV. She is a Kahn's sensei and one of the available masters for the party to study under.
Una resides in Worent and can be found on the second floor of the Elder's lodge.
As a Master[]
Her Will, Wild, is best suited for a character like Ryu or Cray. Ershin, whose hit rate is not high, is a bad choice.
Her first two requirements can be met as soon as the player gets her. Her last requirement, is out of reach at that point of the game and is unobtainable until Chapter 3 (unless the player learn Blitz from an enemy prior).
Excluding Blitz, all of her skills are great and useful.