[quote=@em]
What do you think about using the same power source for both characters?
[/quote]
Kismet's ability is more training, observation and psychology than anything magical, so there's not really a power source behind it, but feel free to play up the mystical side to Arya's powers as much as you'd like. :)

[quote=@em]
Also, reading what you've written, I can imagine Kismet and Arya hitting it off badly, but growing close. What do you think about guiding the story in that direction, should they meet?
[/quote]
I never really plan ahead for what my characters will be doing later on, I just let them react to circumstances as they arise and let them grow from there. Having said that, Kismet's quite a friendly character so it's likely the girls will become closer as the story progresses anyway.