Well there's Pottermore for a start.
iamharrypotter.com
If you like these types of online worlds, try Harry Potter Online, or Hunger Games online.
Yes, there are other Harry Potter worlds other than the chamber of chat. One is Pottermore.
give it to me now Ron. you taste so good Hermione. harder Ron
Yes, there are many Harry Potter RPG's online.
In the Lego Harry Potter virtual castle, Hedwig is in the owlrey.
There are many Harry Potter RPGS (virtual games) out there. All you need to do is preform a search.
Harry Potter is a fictional character.
She is in a closet.
There aren't any official RPG's however there are hundreds of ones set up by fans, try Proboards, InvisionFree, Chamber of Chat and Zetaboards.
At hogwartslive.wizard.pro/, you can play a free multi-player harry potter game online that is fun and exciting. Or you can play other harry potter games at bigmoneyarcade.com.
Well I suppose you could try Harry Potter Online. I think its quite good..