My original Dungeon name was Lord Death, which I'd previously used on Konami's board. Thinking it too generic, I quickly changed it to an even more generic name, castlevania_freak, after my email address at the time.
Abnormal Freak (plus a slew of others: Specially Gifted Freak, QuakeNINFreak, Dysfunctional Freak, and others I can't even remember) came about not long after and is the one that ultimately stuck. It raised questions of what an abnormal freak is, since "freak" itself already implies abnormality; thus, Abnormal Freak becomes Normal Person.
Although once some time later I saw in an online dictionary the word heteroclite, with the description: An abnormal freak.