i havent had very many tbh! before the early 2000s (ouch im a grandpa) i didn't have a go-to, but i wasn't on the internet enough to need one.
Cassidy Foxheart > Moxxy > Crimson-Werewolf > Crimson-Catalyst
warrior-cats-phase name, a name i used because the previous one had too big of a character count for a website lol, a name that originated from a middle school self-insert original story, and then a vaguely more mature rebranding.
Admittedly I don't actually know whether Cassidy or Moxxy came first, because I know Cassidy overlapped long enough that I also had a Crimson Werewolf account on the same sites.
every so often i'll use moxxy again, just for kicks.