This was one of those cracky things that probably everybody has already done, but I couldnt' help it. So yeah, it's some HP characters dressed as MIB/Super Secret agents.
From left to right the characters are supposed to be: Srius, Harry, Scrimgeour, Dumbledore, Snape, Draco, Lupin and Ron.
Hmm... and yep, I actually like Scrimgeour (the Thundercat thing is always cool) and I do have a rather particular view of Lupin (and by rather I mean very, I'm afraid).
Drawn traditionally and painted in Photoshop.