Bleedman doesn't really come into the forums, especially not here in Spam. You would probably have better luck contacting him directly by PMing him on his deviantART here.
That said, I'm fairly sure it's fine to do cosplays of the characters? I don't think he or most creators mind all that much. Still, if you want to be sure, just go PM him there.
Also, welcome to the forums. Be sure to read the rules and lurk a bit, okay?