[Vanitas]

With their hand knive thingies D:

[Holly]

With the pointy rod thing which Moon is carrying, probably.
Seeing as I have no weapons of my own.

[Espy]

The brightness x___X; It makes Espy's eyes bleed.

And all you have to do is shove Espy off a cliff into water.

[Vanitas]

with their sexiness /shot
With the wolf hat

[Kyp]

Probably bash me over the head and toss me off a cliff

[Quiet Man Cometh]

That sharp looking key blade would do.

[Vanitas]

With their scythe

[Ultima]

Every way there is possible. All at once.

[Funkduder]

Slowly. Enough said.

[littl3chocobo]

death by sparkle

[Jurinjo]

Failing my assassination attempt her guardian sentinels would finish me while she kept them battle capable despite my best efforts and poisons.

[Moonless Midnight]

Would probably sick their Bakeneko on me and then stab me with their knives. Quite a painful death I'd say.

[Nefer]

She would probably send me those evil red orbs of hers by commanding them with her scythe and annihilate me that way.....while I'm sleeping.

[Jurinjo]

Consume my body in the holy fire of tails.

[Vanitas]

With their dagger or beast D;

[Nefer]

By invading my dreams and making me have such a bad nightmare that I'd end up having a heart attack.

(The eyes, look at the eyes! xD)