One of the early stars of Game Of Thrones is surely Maisie Williams, who plays the littlest Arya. In an interview with TV Guide, the young actress said that she relates to the feisty qualities of her tomboy-ish character.

“She likes to break the rules and doesn’t really like being how everyone thinks she should be.”

Williams also explains how she’s tried to stay to true to Arya’s left-handedness as depicted in the books:

“When Mum was reading the first book, she told me about Arya being left-handed,” [..] “From then on, I was like, ‘Alright, I’m going to try to do everything left-handed’. When I was practising out in the garden and things I would do left-handed just to feel that rhythm.
“Unfortunately, when it came to filming, sometimes I have to do things right-handed because of the camera angle and things like that. So some people are a bit annoyed that Arya hasn’t done everything left-handed. I wanted to. I really did. But sometimes it was just too tricky and we couldn’t do it.”

Arya is often shown to be the more astute of the two Stark sisters, with Sansa already planning for her idealized future with the nightmare kid. Williams offers her perspective on the rivalry:
“Arya thinks of Sansa as a bit iffy, sort of clueless as to what’s going on around her,” [..] “She finds Sansa annoying as she’s always going on about princes and marrying and having children and Arya just thinks all that’s way, way in the future. It’s a waste of time. Joffrey is not very nice and she can see that, but Sansa can’t. Arya is definitely trying to get through to people what she knows, but sometimes it’s not always the best way and she gets into trouble.”

Source: Seriable