Name champions who YOU think impress you the most, aka look like they're actually fighting duel style all over the screen. Here are my choices:

Lee Sin: It's a Blind Iron Fist, of COURSE he's going to be flashy!
Fiora: She'll cut you down in seconds and look like a boss doing it.
Irelia: Fun as hell and bloodthirsty, she can just keep coming at you.
Darius: He may not be able to spin like Garen, but Darius is definitely more of a pimp when it comes to combat style. And on top of his flashy moveset, he can turn the tide of an entire teamfight without breaking a sweat.
Akali: Basically what happens if you put a more powerful Ibuki into LoL. Fun to watch, and she'll burst down entire teams in the blink of an eye.
Jax: An honorable mention. He looks really fun at times, but his downtimes are less than spectacular.

Who would you nominate for champions that you really enjoy watching decimate people?

Ahri

Amumu blitz cho nunu and nasus(ren) have the most teamfight presence of any character, but i put my vote in as

zed
corki
diana
draven
katarina
yi
sivir
talon
tf
wukong
and xin

Draven. /thread

Darius

Taric