Kate, Jeremy, and Simon are over here, so I don't have to bother with delicious copypasta.

whenshewasnice is a canon thing, sort of. When Scott finally snaps and tries to attack Envy's boyfriend Todd, he exclaims, "She used to be so nice!" And so, since Natalie here is Envy back in the time when she was nice... Behold, username. (I also have whenshewasnt waiting for the future, because I like it and feel like the transition from Natalie to Envy deserves a username change.)

electrocynic, on the other hand, is pretty self-explanatory. She's a superhero working under the capename of Electroclash, and she's a cynic.