Lego

Three pairs of Team Fortress 2 classes: (Engineer and Pyro, Heavy and Medic, Sniper and Spy), Mozart and Salieri (of course... ), Dracula and Frankenstein's Monster, Rocket Racer and Veronica Voltage from Lego Racers (a cool old game), Johnny Thunder and Sam Sinister from Lego Adventurer's theme, and last but not least, Julius Caesar and Cleopatra VII. There's a lot of them, in fact, I posted the most pictures in the contest's Flickr Group.

EDIT: Speaking of Brickheadz, how do you like Ebenezer von Charlatain's Brickhead Incarnation:

[Blocked Image: https://farm5.staticflickr.com/4241/35717041512_89801c9c9f_b.jpg]Von Charlatain Brickheadz by Jarek Wrzosek, on Flickr

YES! Gentleman Ghost! Although I'd rather see him teamed up with someone else, like Solomon Grundy, Once I even made a ride for those two in LDD:

[Blocked Image: https://farm5.staticflickr.com/4220/34894522860_885a3236dd_b.jpg]Gentleman Ghost's Hot Rod Hearse by Jarek Wrzosek, on Flickr

Also, I came with a Batman villain dream team: The Penguin, Gentleman Ghost, and The Mad Hatter. I'd call them Tophat Trickster Trio, that would be cool...

[Blocked Image: https://c1.staticflickr.com/5/4267/34172918653_7bed659ca4.jpg]

Am I the only one who thinks it was a terrible idea for LEGO to use the saussage and turn it white for the boomerang. I mean they already made him with a boomerang model. Why not color that white.

[Blocked Image: https://s-media-cache-ak0.pinimg.com/originals/a0/26/66/a026666ce3363d19f2962bde0979f6bd.jpg]

@Jareen: The Official picture came out, and luckilly, Captain Boomerang uses actual Boomerangs, not white sausages:

[Blocked Image: https://images.brickset.com/sets/images/70918-1.jpg?201711160409]

that is a cool lego bulid