Kingdom of Loathing is GREAT, but I lost my password and lost my level something-or-other Disco Bandit, and am too saddened to start over again.
I play World of Warcraft at my boyfriend's house. It is fun. I'm a night elf druid - not even over level 20 yet, but I do only get to play it at his house.
Psypets is great - an online pet game based on Maslow's (or whoever it was) basic needs doohickey - you gotta feed 'em, comfort them, something something, and then they'll do stuff. Dangerously addictive though - if you don't feed your pets they WILL die. I had to bail out for my own mental health. Sample art commissions I did while playing though:
Annie and
Transparency Opaque. Compare to the actual pet art when you get there. Splee! Oh yeah, and it is possible to have a custom pet graphic, but you have to donate to the site, and it has to conform to the guidelines/general look/size of the prefab pet graphics. And they have a wiki.
And finally,
Gaia Online. Started out mostly as an ginormous pretty message board site, but they're really working on the game part. Best site ever. Ironically, Xyzzyka Gruefrotzer is not the name of my main account, but Spike_Theta is. PM me if you need help - and check out my cutecute avatar!

Oh, and spaces (and various other doohickeys) are allowed in your username (sadly for Mary Janes Last Dance, apostrophes are not), but I cling to my underscore because it defines me (even though my character's name is actually Spicata Calaveras Meridian Chalcedony Truscott...but everyone calls her Spike.

).