Honestly, Sif would be a much better candidate for Thor's partner as a whole- appearances aside. She'd Asgardian, she's tough, and would be able to rule Asgard as Queen with Thor for however long he stays as king. Jane? She's mortal, and unless Marvel decides to implement the apples of Idunn or some other way of making her live much longer, there is no way she can be Queen if she decides to stay with Thor. And what's he going to do if she can't become *immortal* like him? Abandon his duties as Asgard's crown prince/king to live on Midgard with her for the next 50-ish years? Jane's going to die of old age eventually, and even if they found some way to greatly increase her life expectancy, she has no idea what it would mean to be the girlfriend and possibly wife of a prince/king. She's a science major living in a country that supports democracy, not monarchy as on Asgard, and has never been around that sort of thing before. Sif, on the other hand, has. I don't mean to bash Jane, but I really cannot see her relationship with Thor working in the long-term.