I've played on a good number of places since somewhere around 1999. Rather than trying to dig up over a hundred+ character names, I'll just list a couple of main ones. I've been staff on various places as well, but have bowed out of doing that for at least a year or so. This is just the ones I can remember at the moment, I know there's more...
African Tales Muck - Entwidemela, Kiapo
Demi Haze - Kiza
Tena Maisha - Ishara
Lion King Muck - Wingu, Kizawaa
Pridelands Muck - Aya
Meadows Muck - Nova, Maka
Ansible Moo - Gwydion, Kiritani, Lia, Anubis
Shadow Moo - Dios, Ember
Gargoyles Moo - Zia, Tucker, Chaos
Starstones Moo - Kassi
Harper's Tale Moo - R'yn
Hogwarts Moo - Lochlyn
Angelic Layer Mush - Mikage, Kiyoshi
Pernworld Mush - Sorrin, R'owan
Eventide - Sandra, Kaya
Camp Half-blood Mush - Rowan
Demigod Mush - Rowan, Seth, Andrea
Chrono Muck - Kamali
Magical Destiny: The College Years - Kyoko, Disarray
Super Robot Taisen - Sinya, Alina
Final Fantasy Mush/Mux - Wynter, Kira
Final Kingdom Mush - Zia, Hati, Disarray
Star Wars: Generations of Darkness - Aria, Rynn, Skritt