I think meeting Yeul would just confuse her >.< Since she would act like she knows her. Yeul hasn't interacted so much with her own cast as of yet but she is becoming more kid like since her visions are gone.

I think Zelda and Lighting get along okay. Zelda is collecting information if light wants to help her out with that.

I have no ideas for Yuna and Yuffie lol.