I guess since the anon above mostly addressed Fai, I'll just assume that this particular comment will refer to Fai. :3
Anyways, I really like the way you play your Fai. There's definitely room for improvement, and mostly I would point to the examples the anon above said. But overall, I think you play him really well.
I love seeing him interact with the Sakuras and Kurogane. And I'd like to see him interact more with other people (it seems I keep saying that, arg.)
Just keep trying! I hope you don't end up dropping him, because I think you play him really well and I know that you'll get better, too, as you get used to and more comfortable with your character.