As depicted by Offutt, Thulsa Doom possess remarkable shape-changing powers, being able to take not only the form but also the precise mannerisms of Cormac mac Art's close friends. This includes also a perfect sex change ability. On one occasion, Thulsa Doom is able to perfectly imitate Cormac mac Art's girlfriend, speak convincing words of love to a man who knows her well and is in love with her, and engage in full-fledged sex – with the intention of taking Mac Art by surprise and suddenly drawing steel. However, at the moment of his attack, Thulsa Doom shows his true skull face, enabling Mac Art to realize the deception and save himself at the last moment.