The Fool (spoilers for all RotE books, including LST)

[Farseer]

What difference would it have made to the events that Amber was present at, had she been with Vivacia instead? Not too much, if I recall correctly. She helped Althea run away, befriended and organised the slaves of Bingtown, and played a major part in Paragon being launched for the rescue mission. On board Vivacia, she helped to keep Paragon sane and found her way out of the burning ship (another significant moment which tells us much about the Fool, I think, when she talks to Paragon's dragons).
I don't remember if there was anything else, but those are not major changes if you consider a White Prophet got into the play. She didn't really assist in the freeing of Tintaglia, which was the other key event to restoring the dragons.

Fantastic post, Chrischa!

I have more to add but another thing that comes first to my mind is the Rooster Crown (I hear you all groaning !). Now, if Amber had not been aboard Paragon, and also befriended him, she wouldn't have been there when they recovered Igrot's hoard from beside the Rain River and she would not have been on the receiving end of that gifting of the Rooster Crown from Paragon...and nor would Fool be alive, as it is only through the crown that death was later averted.

The question is, is that a good or bad thing ?!

While it could be seen as a good thing, as Fool and therefore the WP still lives, thanks to Changer, it could also be seen as a negative consequence...if Amber had not received the Rooster Crown and had been on board Vivacia with Wintrow instead, the WP would most likely have died in Aslevjal just as he/she had forseen. Who knows what may go awry because this didn't/did happen, simply because Amber may have been where she ought not to have been?

Love it!