In turn, even in her little sister role? She will 100% become protective of him and want to help him out/support him. Which means when he gets hurt... she will be at the forefront to try and help him recover!

Oh hell yes! Her sword can kinda do some crazy/impossible things (such as being bendy like a whip) and Sora's no slouch either in a fight so I imagine it looking real slick and cool as hell! Probably flashy too xD