A reknowned Motavian doctor, Amy Sage is definatly good at what she does, with an unbelievable amount of healing skills. And, for some strange reason, weak fire and gravity magic.

At any rate, while she's not the greatest fighter on her world, or any other, she definately is one of the best in Light, running entirely through Light during one of the earliest seasons, and only finally getting defeated by a more combat-oriented healer. Her record since then hasn't been as good, but she'll heal her way back to the top any time now.