He's awesome and he's ruler of Kahndaq. I know this won't really help but still, I think he trained Osiris to be his sidekick, so why not me?
The Emperor is a wise teacher, even though he's insanely evil (kinda like a tall, evil Yoda). He's trained many Sith Lords and they've come out well at killing Jedi and conquering planets. He'd be my second choice as a mentor.

Ruler of Kahndaq                              Ruler of the Empire

I think that the best supervillains are the ones that mirror their superhero rivals. It's been done many times and it's a trick that's still creative. Nearly all superheroes have evil copycats don't you think?

Spider-Man-Venom, Carnage
Superman-Bizarro, Ultraman, General Zodd, Jax-Ur
Batman-Owlman, Wrath
Hal Jordan-Sinestro, Power Ring, Atrocitus, Agent Orange
GLC (Green Lantern Corps)-Sinestro Corps
Jay Garrick-Rival
Barry Allen-Prof. Zoom, Johnny Quick
Wally West-Zoom
Kid Flash-Kid Zoom
Iron Man-Titanium Man, Iron Mongor
Capt. America-Master Man, Red Skull

The list is endless.

He has a TARDIS and he has a David Tennant like attitude. He'll always make fun from a small situation.

 Laser Screwdriver...who'd have sonic?
Rightly said...rightly said

Black Adam's brother in law (I think). He has Black Adam's powers. More or less the evil Capt. Marvel Jr.

That is if he is evil...

Cool title for a film, right?

Vin Diesel would make a good Deathstroke. He has said he wants to be a villain in a movie.

Home to the World's Mightiest Mortal, Girl and Boy. Also these guys are probably the kindest and coolest superhero team ever.
This is also the summer retreat of my favourite supervillain ever, Black Adam.

Technically, Dracula and other vampires can turn into animals, so he kind of counts as an animal.
One of my favourite animal characters is Brian Griffin from Family Guy.

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Kids in comic books are good. I mean what's so bad about little heroes and even little villains running around with their superhero (or villain) friends. I mean some of the world's greatest heroes started out as kids like Nightwing, Wally West, Kyle Rayner (I think) and even Luke Skywalker!