You didn't answer Guncannon's

Hm...well Wing's suits are pretty OP, but from my understandind Unicorn is pretty OP too. I'd say Wing.

Tendou would beat Tsukasa, travel back in time to do it again, then travel forward in time just to do it one more time.

4Chan for both.

Superman vs. Hulk

Superman, easily. Fourze vs. Iron Man.
EDIT: dammit, ninja'd

Superman.

JDF Vs Seth MacFarlane.

I didn't answer because it wasn't there when I posted mine initially. :lol

Tie. Their massive egos are equal, preventing them from getting an edge on one another.
Phineas and Ferb vs Dexter.

I'm pretty sure Dexter has standards against killing children, or anyone who isn't a serial killer.

Or did you mean Dexter's Lab Dexter?

Yes.

I'd say Phineas and Ferb. Despite Dexter's questionable morality, Phineas and Ferb's technological and engineering aptitude, combined with their magnanimous innocence, would allow them to not only destroy any of Dexter's death machines, but also drive Dexter completely bonkers.

Here's the (second-greatest to Superman vs. Goku) battle of the heroes: Batman vs. Moon Knight.

Moon Knight.

Goku vs Luffy in an eating contest. I'm not sure if this would be allowed since they are not fighting.

Luffy, he can make his stomach larger to accomidate more food.

Xenomorps Vs Navi.