IRC is not a single website, but is rather a protocol utilized by many people and groups for various purposes.
Just try Googling "(thing you want to roleplay) roleplaying forum." If it's out there, you'll find it.
If you can't find what you're looking for, you can create a free forum at Invision Free, Pro Boards, or Zeta Boards.
Omegle is a website that sets you up in a chat with a completely random stranger.
Depending on the universe, you can find people to roleplay with by putting in the right tags.
Specific roleplaying websites are linked on this page.) Chatzy has become a popular roleplaying venue due to the fact that it's extremely easy to set up and customize a chatroom.
Free chatrooms have a maximum of ten guests, though paid chatrooms have no limit.I've got a collection of colors that look pretty decent in Chatzy here.It should be noted that Chatzy has one significant glitch - it will occasionally fail to display new posts.Chatzy also allows users to pick individual colors for their names.The default palette isn't too great, but it can very easily be augmented and/or replaced.Many Tumblr roleplayers set up blogs exclusively for roleplaying, and sometimes exclusively for one character.