Easter Isogiku got damage + Current HP / Max HP / 1. Or +100% dmg when full life. Consedering she can got up to 300% max HP (without FM), it's a potential +300% damages. With healing+max HP FM, she can go up to 325% HP and dmg with 130% more healing. In others words, she can almost heal 25% of her HP each turn. Without her HP drain from skill.
She is definitively an interesting girl.