By Gene Gonzales.
I'm sure this reveals some kind of weird fetish, but Shadow Lass is easily my favorite character from the Legion of Super Heroes and it's got a lot to do with the blue skin. It's also got a lot to do with how she was drawn and portrayed in the Legion Lost mini-series, which is where I first started reading about the Legion. She was all goth and badass, but with an awesome '30s or '40s hairstyle.
Crap. I quit reading Legion of Super Heroes a while ago and now I've got myself wanting to go back to it again.
More evidence that I may have a thing for brightly-colored skin.