Ok...firstly....my opinion:
I personally believe that it is Sora from Kingdom Hearts holding the sign.
Look at the hair!
that is so Sora!
That hair is darkish brown. To prove that it is not black...
Afro guy vs. Lol sign!
compare the hair! the Lol sign has brown hair!
Also, he's very happy, like Sora...
I rest my case.