adj. Me and Batman get described this way all the time.
Real citation: "Oh, God, he thought, please tell me I didn’t just think that! Helping the helpless? I’m turning into my sodding grandad - next thing you know, I’ll be poncing around all Dark Avenger-y. I need another plan."
(Aurelio Zen, "Vita Nova," http://www.allaboutspike.com/chapter.html?id=210&expid=605)
Made-up citation: "Just because I maim criminals, wear black, rescue damsels, and brood like a banshee doesn't mean I'm a dark-avenger-y dude. On the inside, I'm a little sorority girl."