Just some ideas - if not doable or simply too much work, then please don't bother. I'll be happy with just one or two ;)
Also, please prioritize on the easier pieces like "Putting Words Together".
1. Final Fantasy Tactics Advance:
"Snow Dancing in the Schoolyard"
http://www.youtube.com/watch?v=ps3rPYRP7jA&feature=related (http://www.youtube.com/watch?v=ps3rPYRP7jA&feature=related)
"Walking in Ivalice"
http://www.youtube.com/watch?v=cnwjDXCN4K8&feature=related (http://www.youtube.com/watch?v=cnwjDXCN4K8&feature=related)
This is hard to arrange for one player. Maybe you can arrange this for four hands?
"Marche"
http://www.youtube.com/watch?v=s17xHRqCc5w (http://www.youtube.com/watch?v=s17xHRqCc5w)
"Battle of hope"
http://www.youtube.com/watch?v=VrKGgKc8v1o&feature=related (http://www.youtube.com/watch?v=VrKGgKc8v1o&feature=related)
In the brass section, maybe blast out those big chords with the left hand?
2. Final Fantasy Tactics A2:
"Putting Words Together"
http://www.youtube.com/watch?v=1oo22YJHBtA&feature=related (http://www.youtube.com/watch?v=1oo22YJHBtA&feature=related)
A simple and beautiful piece.
"Determination"
http://www.youtube.com/watch?v=DpyounseEVw (http://www.youtube.com/watch?v=DpyounseEVw)
This is here just because it's the best piece in the game. A piano arrangement would be very hard in my opinion, but just perhaps you might see a way to make it work.
"Summer Holidays"
http://www.youtube.com/watch?v=-nd4XqSV2u0&feature=related (http://www.youtube.com/watch?v=-nd4XqSV2u0&feature=related)
"Sky Pirates From the East"
http://www.youtube.com/watch?v=16X5i517JhI (http://www.youtube.com/watch?v=16X5i517JhI)
Actually a piece from FF12 originally ("Penelo's Theme").
Thank you!