I'm Travis, I have Xerc here. He DID grow up at Trabia Garden before the missile attacks, so if Rhea was around during that time, she may remember Xerc being a youngster running around and his parents were instructors there too. If she started after that time, they can still bond over Trabia-ness. Xerc is all around friendly with everyone anyway. :D
I also have Dona from FFX (kilikalegend) and she's snappy and rude, so any run ins with her are probably memorable for all the wrong reasons, but as I've stated before, she's trying to be nicer. She's the same age, so they probably were in classes or have been on missions in the past, for better or worse. XD If she's condescending, Dona is too. They may actually get along now that I think about it.
Anyway, NICE TO MEET YOU! So many new peeps joining, I'm thrilled!