Assassin's Creed: Brotherhood pre-order bonus seems apt for the terrifying Harlequin character: "Behind the gaudy costume and twisted smile lies the soul of a merciless assassin. You call yourself the Harlequin. Your victims will call you a walking nightmare." Presumably the whole "walking nightmare" thing is because you're a "merciless assassin," but for us, the clown makeup is sufficiently horrifying in its own way.
No details have been provided on what other retailers might give to pre-order customers, but if past Assassin's Creed "retailer exclusive" bonuses are any indication, the Harlequin will be available for all to play eventually (presumably for a few virtual bucks). We've dropped an additional image of the terrifying multiplayer character in our gallery below, should you be so inclined. Oh, and you can pre-order the game right here.