Which despicable act of villainy has made a "nobody" villain memorable for you?
Personally, I was surprised by how much I despised Doctor Light's portrayal in Identity Crisis. From being a guy who would get the crap beaten out of him by some members of the Teen Titans, It was one hell of a revelation that he was turned into that joke of a villain by the Justice League magically giving him retrograde amnesia and personality change for him sexually assaulting Sue Dibny. It is such a low blow for a B-list super villain that some readers would avoid learning about him and ultimately this is what makes him a memorable villain for me after that revelation. Especially with the fact that he'd beat down nearly every member of the Teen Titans after recalling his memories.