Character balance

One of the great things I've noticed about League of Legends is the balance they have managed to achieve with a pretty diverse cast of characters and rolls. There are no less than 6 distinctive roles (i'm sure a real pro would count more) in the game and, in watching 4 or 5 top games, I've seen xx get used

Malphite

Anivia

Yorick

Blitzcrank (never played but always banned... so I'm counting him)

Katarina

Graves

Lulu

Jax

Ahri

Amumu

Ashe

Annie

Caitlyn

Ezreal

Evelynn

Dr. Mundo

Maukai

Cho-Gath

Irelia

Janna

Karthus

Kog-Maw

Lee Sin

Lux

Miss Fortune

Nautilus

Nidalee

Nunu

Twisted Fate

Orianna

Rammus

Singed

Sona

Vayne

Trundle

Xin Zhao

and that's just the ones I remember... That's a pretty incredible diversity considering...