The way I picture Sora is as a highly mobile/versatile fighter who is fast, combo-oriented, and, his gimmick, can change fighting styles on the fly via Form Change.
In terms of movement, he's got regular movement, Aerial Dodge/Double Flight, Dodge Roll, Quick Run, (Super)Glide, Teleportation, Airstep and Flowmotion, all of which could be used.
In terms of fighting styles, it depends on which Sora we use. If we use KH2 Sora, he's got Valor Form (Physical Attacks), Wisdom Form (Magic Attacks), Master Form (Physical and Magical Attacks with a lean towards Magic), and Final Form (Pretty much everything).
If we use KH3 Sora (which Disney probably would), he's got access to Second Form, Strike Form, Element Form, Guardian Form, Blitz Form, Rage Form, and Ultima Form, all of which offer their own unique abilities/fighting styles.
There's also the Command Gauge and Shotlocks, which offer a variety of powerful attacks that he could build up to.
The dude's got moveset potential in spades.