Basically, all you gotta do is either bring a persons HP down by one by attacking (hurt) or heal them, and make them get closer to having full HP (heal). So we're going to start out with a list of 50 characters, in no particular order. I'm throwing in the rest of the Organization XIII, as well.

I'll start:

Hurt Vexen
Heal Riku

Vexen: 4/10
Marluxia: 5/10
Riku: 6/10
Sora: 5/10
Goofy: 5/10
Tarzan: 5/10
Pete: 5/10
Malificent: 5/10
Jafar: 5/10
Oogie: 5/10
Jack Sparrow: 5/10
Kairi: 5/10
Aladdin: 5/10
Cloud: 5/10
Leon: 5/10
Aeris: 5/10
Xemnas: 5/10
Ansem: 5/10
King Mickey:
Berserker Nobody:
Tron: 5/10
Auron: 5/10
Pixies: 5/10
Xigbar: 5/10
Xaldin: 5/10
Demyx: 5/10

Hayner: 5/10
Tidus: 5/10
Selphie: 5/10
Yuffie: 5/10
Roxas: 5/10
Axel: 5/10
Saix: 5/10
Donald Duck: 5/10
Jack Skellington: 5/10
Alice in Wonderland: 5/10
Cid: 5/10
Merlin: 5/10
Louie Duck: 5/10
Tifa: 5/10
Sephiroth: 5/10
Beast: 5/10
Chicken Little: 5/10
Wakka: 5/10
Lexeus: 5/10
Zexion: 5/10
Hades: 5/10
Hercules: 5/10
Namine: 5/10
Mulan: 5/10
Simba: 5/10

Right, so now that I've started, you guys need to carry on with the chain. Once a character has been killed, and replenished from all health points, then their automatically erased from the list, but once a person has gained full health points, they are sectioned off from the other characters, and listed as winners, eg...:

Winners:
Aladdin-1st Place
Tidus-2nd Place
(BIG SPACE)
Pete: 2/10

Copy and paste each time you post, and you will be posting every five consecutive posts, and wait your turn, to keep it fair. Got it? Fantastic, now lets roll.