Originally Posted by
Sutekh
Her original base power was to transform into any form of energy along the electromagnetic spectrum. Visible light, ultraviolet, X-rays, etc. She could blind people in light form by flying at their face, or tighten her focus until she turned into a laser beam (or maser beam if in microwave form, or 'graser' beam in gamma ray form, etc.). She flew at light speed (around the world eight times in a second!) and was intangible in most of these forms (although limited by the form she was in, visible light generally doesn't go through opaque matter, for instance, while X-rays can be blocked by a thickness of lead, etc.). She could also fire bolts of force, which was sort of a random side-power that, even when I was young, I thought was really extra and unnecessary (just not in those terms).
Later she gained complete control of all those various energies, so that by her appearance in Nextwave she just randomly did anything she wanted, so long as she said something about energy when she did it. Irradiate an entire ship? Sure! Create a massive microwave explosion? Go for it! She also gained the ability to create a hardlight body which could slam into a planet at lightspeed and blow it up, and it was explicitly pointed out that she wasn't just 'turning into light' or 'turning into microwaves,' but turning into her bodyweight in that form of energy, which, since energy weighs almost nothing, means that she was turning into a ridiculous amount of that energy, since 120 pounds of microwaves is *a lot* of microwaves... She also could change her body at will, turning to energy and then changing to look like someone else and re-solidifying as them, and stated that her body was just a construct she had formed from her energy and was immortal. She also explicitly thought and reacted at the sorts of speeds that allowed her to take better advantage of her ability to move at lightspeed, which was kind of insane and more like how some DC speedsters work than anything Marvel did (or, did well, IMO, since they quickly lost the plot and it seemed every appearance spent more time discussing what new crazy stuff she could do, rather than develop her as a character, and thankfully she seems to have come down a bit from these planet-busting power levels fairly soon thereafter). Basic comic book wonkiness.