I no of a few , but not all. I would say:

Gambit - charge the earth?

Magneto - duh

Iceman - the next ice age

Jubalee - so powerful

prof X - could start world war 3

anyone?

cmon

what are you talking about?

omega mutants= mutants that can end the world

So does that come from somewhere or is this a Magoogles phrase?

Iceman isn't powerful enough

Neither is Gambit

Jubilee is a funny joke

How would Magneto end the world exactly?

By your reasoning for Prof X you are relying on his manipulation of others, which every human being is able to do to some extent.

So my vote is the President of the United States as soon as he gets cancer.

i think the only two "OFFICIAL" omega mutants are:
phoenix
iceman

Sienna Blaze- she could upset the magnetic field or something, potentially destroying the Earth.

Jubilee couldn't kill time. She couldn't hit the ground if she fell. She is so pitiful, Jerry's kids send her money. She is so lame, Stephen Hawkins helps her around.

yah mabe not jubilee my friend told me she could but gambit could just put so much energy into the planet it would explode and magnito would easily destroy the world earths core has a lot of metal in it or he could just set off all the nukes on the planet like holy isnt that pretty obvious almost everything is made of metal , duh

also KRoc you r rite everyone kinda does but not to prof Xs extent he could make every country in the world detonate its nukes not everyone can do that

Iceman and Pheonix, I agree.

Iceman is always holding back, he could freeze all the water molecules and turn earth into a giant ice ball.

If Iceman could do that then why does he hold back in fights for his life. He can kill anyone in an instant by that same reasoning. Is he that much of a Sally?

magoogles, as I said the president could do that, or at least cause enough to be detonated to end the world. As soon as he gets cancer hes a mutant so he's on my list.

I don't think Gambits energy is limitless so I don't see him charging the earth. If it is limitless then why doesn't he just charge the people he fights until they explode? What's the largest object Gambit's charged?

Magneto would be able to destroy the world very easily. The earths core is made out of iron, a very magnetic metal. He could disrupt the core and that would make all volcanos, even extinct ones explode. It would also create massive earthquakes all over the entire planet. Within enough time everyone and everything would probably be dead.

Iceman is powerful, but to be able to frezze the whole world would be incredible. The earth is gigantic compared to Icemans size.

Read Legion Quest. His mental blocks were removed and he froze EVERY molecule of water in Legion's Body.

The reason he gets beat often now is he has psychic blocks put on him to keep him from doing that.

Gambit can only charge in-organic objects.