Not a long list, but it was fun while it lasted. In roughly chronological order of when I started playing the character (and if you remember TarotMUCK, you have just impressed the hell out of me, because I haven't yet met stumbled across someone else online who was on any game in 1990).
TarotMUCK: Pixel
PernMUSH: Rian
CrystalMUSH: Deidre
CrystalMUSH: River
CrystalMUSH: Kira
Crystal Dreams: I honestly don't remember my character's name. Didn't last more than a month or two.
FiranMUX: Sholana
FiranMUX: Yandora
FiranMUX: Niva
FiranMUX: Isa
FiranMUX: (scattered random handful of characters who lasted for days at most)
A Snitch In Time: Hagrid
FiranMUX: Tarana
FiranMUX: Kelarik
FiranMUX: Talon
FiranMUX: Natan
In addition, I staffed on Firan from late 2000 to early 2002. (No, I didn't kill your character. Unless the shark ate it, that is; I built the shark. So if you got eaten by a coded shark, oops. And if you fed someone to the shark, shame on you. Sharky probably got indigestion from that.)