i can only name a few from the top of my head:
Him [Powerpuff Girls (one of my childhood heros)]
Vanity [Smurfs]
Bugs Bunny [Don't you fucking deny it]
Roger [American Dad]
Stewie [Family Guy (hurr durr)]
Peppermint Patty [The Peanuts]
Velma [Scooby Doo (I always thought she was a lesbian, even as a kid)]
Ren & Stimpy [Even as a little kid I thought that they were married]
That one retarded cat from Thundercats
Snagglepuss
The Pink Panther [ALWAYS struck me as being gay]
Anyone from any anime thing ever
gahh.. google gay cartoon characters, there's a lot of them