Gaiaonline.com
Make a parent account for your avatar and personalize your chat settings
ourworld.com is a pretty good website look me up and ill walk you through it my avatar name is mimiluv01
Second life.
I don't know what websites are "Avatar non-downloadable IM chat sites"
IMVU or Runescape,(:
Maidmarian
The Wolfhome avatar chat website was first started in October of 1999. The site is owned by Wunderwood, LLC and is part of the Chatlands series of chat sites.
Roblox is a great one! www.roblox.com
yes moviestarplanet.com
girlsgogames.com
You can not chat on your avatar with others while you are logged into your account. Your avatar will immediately start chatting with other non-active avatars when you log off.
imvu-where u can make n avatar fallin love make friends and much more