A song of Ice and fire discussion (spoilers incl A Dance with Dragons)

['thul]

Spoiler

Jon might not be capable of mounting a dragon like Dany is, but he might theoretically be able to ride a dragon, he is after all a skinchanger. Whether dragons are compatible is unknown.
He does fit many of the criteria that Dany looks for, He's young, physically powerful, very much an alpha, bound to certain strange forms of honor, and has power. We get the feeling from the last book at least that Stannis isn't going to last. Martin downplayed his usefulness quite a bit. The one thing he had that the night's watch did not have is numbers. If the Night's watch had actually been of proper strength, they would have ignored Stannis. The Watch numbers in the hundreds when it should have numbered in the tens of thousands. One mistake made upon founding the Night's Watch was the oath of celibacy and the single-genderedness. It did prevent a dynastic tendency from forming, but it also made sure that taking the black would be unattractive. The kings of Westeros feared the theoretical potential that the wall could pose if it abandoned its purpose too much.

These beings doubt that any of Tyrion or Jorah Mormont will manage to hook Dany. Tyrion is actually fairly old, has a rather visible nasty streak and is treacherous. Jorah Mormont betrayed her, and dragons are many things, but forgiving is not one of them.
The fact that Tyrion is also officially married does not help him. Tyrion might succeed as an advisor, but not much more. Jorah is also fairly grown up, whereas Dany is in her mid-teens.
Victarion might have a slight chance, but too little is known. He does have the fleet she lacks, though with some trickery within the population in or near the Harpy's nest, she could fairly easily get a number of extra ships. Combine those two and you'll have a formidable fleet capable of landing pretty much any army over in Westeros. Even an army made up of unsullied and an entire Dothraki horde.
The unsullied would provide her with basic crew for the fleet, but she would still need someone that knows the seas, and if there's one thing iron-born know, it is the seas. That red priest following along with Victarion would also be interesting to Dany.

Doran Martell is still fairly unknown to Dany, and she's quite possibly less trusting of alliances bought with marriage than she was before.