This was the best way I could think of this question honestly. Most topics we've seen are favorite power, best powers, this or that power etc, etc but never saw one that asks this til now. So I figured what the hell.
You can list or discuss any power you wish. Of course anything can be used for devious means, but I would think the most IMO would be:
Telepathy: After reading the last issue of Flash, with a character named Psyche. Had me thinking, you could totally use this for so many devious means.
Invisibility: Watch Hollowman, nuff said lol.
X-Ray vision: Pretty obvious why I would think.
Telekinesis: Watch Chronicle, you'll see where I'm going with why.
Super Speed: Pretty easy to do lots of things immoral with this power.
Ok that's all I got for now, posts yours.