i don't think arya will change much more from where she is now. but of course that's a big change from where she was. a tomboy is one thing, a murderer is another.

i don't see her remaining with the faceless men or completing their course. she is too much of a stark for that. but i think she will always be able to kill and will become quite the avenger when she returns to westeros. i think she'll be a major player in the last book.

what i do wonder about is her connection to gendry. they've already bonded and forged a strong connection. i sort of expect it to continue when she returns but at the same time, i can't see her marrying him and settling down. that's where i'm not sure what will happen.