Haha, the image does rather provoke that conclusion, doesn't it?
But how awesome would that be? I mean, if Sirius were Dracula? *spoileralert* He wouldn't have gone to Azkaban because of that ratty-faced traitor Peter Pettigrew, wouldn't have had to go into hiding once he got out, and might not have been killed by Bellatrix in OotP. *spoilerend*