(Fellow Trekkie?)
I am a Changeling. (http://en.memory-alpha.org/wiki/Changeling) I become the gelatinous form, and he weapons don't harm me,

but the explosion kills the next user.

However, I happen to be standing behind a wall of depleted uranium, which absorbs the explosion.

 

The next user has all of the protons in their body turn into neutrons

@Michael238 (View Post)

 And all my neutrons turn into protons to even out (yeah, physics work like this in my posts)

 

The next user is killed by the nuclear explosion that happened when my particles transmogrified (yeah, this can happen too)

That person was a twin that happened to look like me.

 

The next user is killed by being thrown into a black hole.

I managed to enter a stable orbit just before reaching the event horizon.

 

The next user is chained to a steel chair and is forced to watch a 90 day long nyan cat video.

The computer crashes due to a nyan cat virus inside the computer and I hop away with the chair.

 

The next user is inside that computer with the nyan cat virus.

It happens to be so big, there's a city in it, i live there happily ever after.

 

The sun is thrown at the next user.

you didn't because i'm a large black hole instead we merged together

 

I and the previous user suck in the next user which is coincidently is inside our event horizon

I happen to be a supermassive black hole, so I suck both of you in.

 

The next user is trapped on a planet that is slowly being torn apart by my gravity.