swain, he would win the war even before he entered the battlefield.

Xerath.

Oh you need this city destroyed? *boom* next?

swain or j4

Go for Teemo. Litter the field with mushrooms and watch my enemies get poisoned to death.

Syndra.

A legion could not stop her, all she has to do is lift a giant platform of earth the enemy army is standing on high into the air, then drop it. She could destroy castles like nothing too, with the same strategy.

Its a shame she isn't as powerful as her Lore suggests she is xD

Honestly .. it sounds like just about any of the champions would be OP as hell in real life war... I mean even Janna a big ass Tornado would wreck an army.

Garen. why? "OW YOU HIT ME!" ...7 seconds later.... "SPIN TO WIN!!!" ....another 7 secs later.... "I"M BACK!!!"

Im thinking.... Cho'Gath. All he has to do is eat everyone, get max stacks, then just eat people to sate his insatiable hunger.

Darius, chop off the head of everyone around. Also Hecarim, scaring the s**t out of everyone and trampling them.