I have to agree with ProjectX2:
In the Ult. Universe I think he's just an average mutant with super strength who wears a helmet for protection and has no relationship to Xavier.
I also have to say, that I'm among those people who don't care for Juggy at all. To me, he's just one more big, strong guy like the hulk of thing, except that he's a baddy. I have to admit, though, that I never read much about him. I heard he's an X-Men now... *shudder*
I want to believe that Juggernaught is a common mutant, mainly because I don't want to see too much magic in the UU. HAving Dr. Strange is already to much for my personal taste.
I also don't want to see Juggy related to Xavier. There are way too much family ties around the 616-Universe, which I don't want to see repeated:
Xavier - Juggernaught (and both gain super-powers from a different source - such a COINCIDENCE...)
Cable - Scott & Jean
Rachel - Scott & Jean
Havoc - Scott (I like that one actually)
Gambit possibly also related to Cyclops
Stryfe related to Cyclops via Cable
I don't know how many more I'm missing already.
I want the UU to be original.
I really cringe when I think about Rogue and Gambit
I like the Idea that Emma might have had a relationship with Xavier, instead of Scott. I like her to be a idealistic scientist instead of a former criminal.
I like the fact that Xavier and Moira are turned into divorcees.
Hey, I'm even getting fed up with MJ in Spiderman.
I'd really, really like to see her fall in love with someone else, dump peter, break his heart and NOT come back to him eventually. He'd go through a hard time of love sickness, eventually get over it and EVENTUALLY we'd see him get together with SOMEONE ELSE!!!
Wouldn't that be awesome?