Warning: Spoilers Off applies to this page. Proceed at your own risk.
In Chapter 1: Arrival, upon learning about a Nobody being unable to feel, Sora felt pity for them never experiencing the joy of being a living person. So he gave Roxas moving words to find his own path as a person he wants to be than just a copy of Sora. This would motivate Roxas into being a great hero to others.
Chapter 3 Winterfell:
Even if Sansa started out as a big sister bully to Arya, she isn't that cruel to leave her sister to go out into danger with the Heartless attacking the winter town. Even going so far to pull her into an embrace to wait for the Heartless to finish them, only to be saved by Roxas.
She has considered to apologize to him from their first meeting, but when she took a look at his face without the hood, the eldest daughter was practically swooning in front of his face and heroic deeds.
Chapter 7: Arya's nameday with Roxas introducing a birthday song which she really loved as well as a wooden carved Keyblade Roxas made for her.
