I'd say Spirit Form: A form in which Sora fuses his hearts with the those locked inside of Kingdom Hearts itself, perhaps aquired at the end credits once Sora & Riku cross into Kingdom Hearts itself, though the player must restart the game and it's ulimately then usually after the Sora vs Roxas battle. But in such a state Sora is the exact opposite of Anti-Form, he's completely glowing from head to toe, in a sort of holy light aura, and in his right hand the ulimate keyblade; a keyblade of light unseen in shame, only it's true form is revealed to the opponent before death( a sudden flash of it's true form if you will)....His movements are very fast so much so it appears he's two or three versions of himself...special moves include: Ray of light( shoots a beam of light through the opponents heart evaportating them into nothingness), Disillusioned-(Sora rapidly teleports around the opponent striking them; more like a teleportation version of Sora's limit)...of course whilst in this form Sora moves like Wisdom & Final form...
Then again the idea of a drive bonding Sora & Axel together is cool too, right before Axel dies his body bonds to Sora creating such a form: Humanized Inferno- In such a state Sora's hands are eclisped in flames and he wields two keyblades ingulfed in flames, when striking the opponent they become ingulfed in an inferno...the style looks much like Valor form except it incorperates the Organization robe style into it; his special attacks are just like Axel's, wall of inferno, blazing hurricane( the attack he does to Roxas in which he creates a trail of flame behind him which pulls the opponent into it causing damage), and fire tooth(his move from kh:com in which he teleports rapidly and fires homing fire balls at Sora)
well thats the best i got
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