Yes he is in his mankini and the king is the ice king from adventure time.
There is Dr. Weird and his assistant
Dr. Girlfriend and No. 28 (i think)
Scooby and Shaggy
Milhouse and some other are playing angry birds.
Zoidberg is yelling at the cosplay winner.
There is also the Heath Ledger joker in the nurses uniform.
I think Leela (futurama) is flipping off Cyclops (x-men)
There is the Gay (batman and robin knockoffs) from saturday night live and I think the candygram shark.
Im not sure but I think I see an assassins creed guy.
Karate kid and the blonde guy he fought are holding hands. lol
Mr. Smith from the matrix. (The bad computer guy always after Neo. Think he was smith anyway)
This is fun.