Actually, Vash's arm changed against his will. He was only sitting there because he was trying to stop it. He even told the guy to run the hell away. He's also taken more serious wounds than that and survived easily... and kept moving as well.

In the fight with Knives, later on, we see that he can change his arm into a gun extremely quickly... when he's not resisting it. And, moreover, can do so while moving.

Exactly, Sephiroth would force him into a position in which that would happen.........the arm would change against his will, though Sephiroth might just stab him repeatedly in the face when it starts changing.

How about this one, in a battle royal on who can destroy the most areas faster we have for team marvel Thanos (Destroyed a race) Exodus ( I think it was an island or somethin) And Galaticus (Eater of planets) Versus team japan Unicorn (Yay Transformers planet eater!) Sephiroth (We all know what he can do) Vash (Mr oops I am sorry didn't mean to that...) Versus team massive destructive space ship the death star. Who wins? Besides the people who have to pay $8.00 to watch on pay per view and the people making the money off the event?

Having little info on Marvel's side (and who is Unicorn, I've heard of Unicron, but not Unicorn), I think I'll post my own versus
generic D&D 20th level Wizard w/ 20th level Palidan (sp?) versus Jedi Consular w/ Jedi Guardian

Spirit - Death Star pwnz jo0.

Paladin loses to Jedi Guardian, but Wizard has a pretty good chance of ganking the COnsular... Unless the Consular decides to Grip/Force Lightning the Wizard, then the latter is screwed.

But overall I favor the Jedi. Their prescience and speed is a massive advantage.

Between Galactus and Unicron, the Death Star'd get sucked dry pretty quick.

I mean, what chance would it have? It's designed to attack planets moving in fixed orbits, not giant robots/space gods which are more than capable of dodging.

The only chance for the Death Star is if Unicron and Galactus fight over who gets to eat it, one kills the other, and the Death Star manages to shoot whichever one wins before the winner's attention returns to the Death star. And that the Death Star is able to kill the winner in one hit (Slightly possible in the case of Unicron, pretty doubtful where Galactus is concerned).

Not to mention the Deathstar despite its name is quite a lot smaller than Unicron and I assume Galactus. The Deathstar is small moon sized while Unicron is a little less than earth sized. So yeah the death star is pretty much the loser in the planet destroyers category. Not to mention one little fighter and two missles turned it into space dust.

The deathstar can also turn an entire planet into space dust with a single blast. I don't think you understand/are thinking about how much raw energy it takes to not only break up or melt a planet, but put enough kinetic energy into it's molecules that they all fly away from each other, as opposed to just turning it into a molten ball, cracking it into chunks that move back together, or blasting it out of orbit. The energy of it's main gun is far more powerful than anything Galactus or Unicron has access to.

You're also forgetting that a fighter and two missiles only beat it because it was designed with one specific weakness in it's exhaust port that anything larger than a fighter could never possibly exploit... because only a fighter could get under it's shields to fire into there.

AND the turbolaser, once fired, moves at the speed of light, and it has many many other weapons that could turn a planet into a molten ball in a little bit of time.

Plus... it's commanded by the emperor and Darth Vader... who are both extremely powerful force users, and thus would be able to see Galactus and Unicron coming and have the deathstar shoot where they would be, instead of where they are. Force precognitive abilities and all that....

So they team up and as one gets shot at the other smashes the thing into a blackhole or destroys it with a nice punch. Starwars shields are mainly energy repulsive. A good physical knock will still transmit quite a bit of eneregy through.

yeah, but would the big robots really be expecting a small planet to be able to blow one of them up? (especially considering how long both of them have been eating planets much bigger than the death star)

Let's assume this is a completed version of the 2nd death star, the one where they got rid of the exhaust-port weakness, and assume it's being commanded by Darth Vader and the Emperor.