Yavoli
From Portals of Phereon Wiki
Unique lightbug. Yavoli can be found in forest tile events, if you have a free party slot. Her event consist of a battle against several lightbugs, Yavoli will join your side in the fight. Upon winning you will also get leather armor and sword from every enemy.
Yavoli is a strong unit regardless weather you use her as a melee unit or a mage. She does require a few level ups, to make her wisps viable in combat.