(SPOILER)Vaan and Penelo are just friends. No Love, actually. Well, as far as I know. But Penelo said "Every good sky pirate needs a partner with him"....

I also think there is no Ashe/Balthier/Fran thingy (Whack Aria). Ashe loves Balthier but Balthier loves Fran but Fran loves Penelo but Penelo loves Vaan but Vaan loves Basch but Basch loves Reks but Reks loves Vossler but Vossler loves Larsa but Larsa loves Vayne but Vayne loves Reddas and so on. No solution.

Maybe just between Balthier and Fran (In Pharos at Ridorana, Fran and Balthier...... "Shouldn't you be running away? That's what a sky pirate do." "Hang on, Fran" Sweet.) (Then, in Bahamut, Fran and Balthier....... "I think you fit more in the supporting role" Sweet, yet again.)