I apologize for the confusion - Ndreare was stating along the lines of what I'm looking for. I was thinking of the horns the character in Horns had, but I wanted it to apply to the entirety of my character, so long as the power was active (it would've been limited to the horns, but persistent in the book - for my character, it would be the whole character and require END to keep it up).
For example, if an NPC was going into a restricted area of a secret facility, my character, while using his power, could grab the door before it closed and walk in behind him, and no one around would care. If I stopped one of them and said, "I'm not allowed in here, right?" They'd get a bit confused, say "no, you're really not," but not try to escort me out - in fact, they'd try to go right back to ignoring my character. If I pressed the issue, they'd get annoyed and say something like, "we've been over this - you're not allowed in here. Now, will you leave me alone? I don't have time to keep explaining this to you!" On the other hand, when I dropped the power or attacked someone, everyone would suddenly be clear about the problem, and quickly report a security breach. That's what I'm looking to be able to do. It gives the advantage over Invisibility that I can interact with people while using the power (though the longr the interaction, the more irate they'll become), but the disadvantage that, retroactively, nothing I did was hidden...