Omnimimicry – A power to turn one’s self into any type of energy, matter, animal or character. The character with omnimimicry combines (414) Substance Mimicry (many), (172) Energy Mimicry, (314) Molecular Manipulation (self) and (017) Animal Anatomy (multi).
Even an upper level shape shifter like the Impossible Man (Marvel) has never shown an ability to turn into energy. Loki (Marvel) has stated that “I can turn into anything, as long as it’s me,” but Loki has been known to lie. Generally, Loki takes on animal or use his power for impersonate Thor.
Loki Agent of Asgard #8
Perhaps this extreme form changing one’s form is an example of subatomic control over one’s body and/or a specialized type of (371) Reality Warping.
Mister Mxyzptlk (DC) can probably turn into almost any form of energy or matter but generally transforms others, especially Superman, not himself. In Silver Surfer/Superman #1, Mister Mxyzptlk fights the Impossible Man (Marvel) and the reader is treated to some over the top shape shifting.
Proteus is a reality shaper that focuses on transforming his own form but needs to go through bodies to do this but is still one of the most formidable enemies the X-Men have faced (Uncanny X-Men V1 #127).
Shaping others or the external environment is probably less likely to lead to madness than shaping yourself and this is probably why reality warpers prefer to shape the world around them rather than their own bodies. Mad Jim Jaspers in the masterful hands of Alan Moore shows us what happens when a reality shaper decides to shape himself and not external reality.
Next 325) Omnipresence