Lux... I'm going to go with 5 - 10. Expend 4 of your unarmed humans wasting her cooldowns.

After that... Well I know she is a trained member of the Demacian military, but she doesn't look like she has much physical strength. Rush her together and go for the neck snap before the lasers come back.

I don't think humans can even hit a ninja. Shen the ninja would 1:to hard to hit 2:be to tanky to kill. Plus in his ninja training he learnt to live forever using regen daggers. Shen could then ulti over the map to his friend alkali and just take a nap while she sliced them all with her axe. Then last but not least kennen would just lighting in with his lightning thing. and evaporate them all. I would say if they work as a team they would last forever. Seprate
Kennen 400 before he gets out of his lightning thing.
akail 200 before her axe gets to blunt
shen before he gets tired or drowns in all the blood.

NINJAS UNITE!

One. Lee Sin would kick my favorite champion's ass.

I think xerath can just float above them or does he fly o:? Anywho just float/fly above them and keep killing them it would maybe take somewhere near 1000 or so until they stack up to grab him by the leg.

Singed murders the world with his awesome trolling gas

Kog'maw at level 1: Maybe 5 or 6 people. He may melt through a few, but he's squishy.

Kog'maw at level 18: Oh god! What have I done! That guy just melted! (Not a snowball's chance in hell unarmed humans would kill him)

kat cant die. she can just spin indefinately.

I have two.

Fizz: 60-100 His shark could cut through a bunch, and he is a pretty Nimble Fighter :P

Xerath: I have no clue. They would just touch him and disintegrate, so.... An infinite amount?

Nidalee. Really? If anyone gets close enough, they'll get scared off by those killer looks. Nidalee is the Queen of the Jungle. And she rapes. Everything.