I'm still writing bio's for the other ones, but here's my first one:
Cursed by Skeletor's dark magic the proud warrior Ugrim was turned into a savage wulfman. As a raging beast Ugrim scourged the northern villages and his ferocity knew no bounds until the evil that took hold of him was contained by the Sorceress of Grayskull, who blessed him with a protective amulet, thus reversing Skeletor's curse. Ugrim pledged allegiance to the heroic warriors, to whom he serves as a valuable ally. He remains a treath however because once the amulet is removed the wulfman takes over again.