Limit Form

This is the new form you'll get in Kingdom Hearts 2 Final Mix, I'm guessing you can get this Form sometime in Twilight Town after your 2nd visit. I'm not sure what power ups you'll get in this form this Form, but I do know you'll be able to do Sora's Dodge Roll, Sonic Blade, Strike Raid, Ars Arcanum, and Ragnarok abilities from Kingdom Hearts 1 (which is just called Kingdom Hearts). The good news is your party member stay with you while in this Form, you can go into this Form if there is two to zero party members with you, and you'll recover health each time you do a Limit attack. But your drive gauge still goes down (If the drive gauge runs out when the number is on zero, you will automatically change back to Standard Form). By using Sonic Blade, Strike Raid, Ars Arcanum, and Ragnarok, you give some EXP points to this Form.

Anti-Form

You can change into this Form, but not keep it. You'll turn into this Form unexpectedly after turning into Valor, Wisdom, Master, or Final Form. You merge with both of your teammates and turn in to a Heartless like Form (but your still Sora), and you lose your Keyblade and must attack with your claws. In Anti-Form, you'll have increased strength, get amazing speed, and can used combos that deal tons of damage. Unfortunately, you can't have any one in your party until you go out, the attack option is the only available option in your command list, and your drive gauge goes down (If the drive gauge runs out when the number is on zero, you will automatically change back to Standard Form). You can't revert out of this Form manually , you can only go out when your Drive Gauge is fully depleted.

Final Form

When you merge with both of your teammates to go into Final Form, your costume will change into a white outfit and gain the ability to use two Keyblades (you can select Master Form's Keyblade through Sora's equipment in the item menu). In Final Form, you'll have increased strength and magic, and your Keyblades attack as if they have a mind of their own. Unfortunately, you can't have any one in your party until you go out, and your drive gauge goes down (If the drive gauge runs out when the number is on zero, you will automatically change back to Standard Form). Defeating one Nobody gives your Final Form 1 EXP, which is needed to level it up. You can only get this Form by changing into Valor, Wisdom, or Master Form and unexpectedly change into Final Form. Once you unexpectedly change into this Form, it is yours to change into any time.

Master Form

When you merge with both of your teammates to go into Master Form, your costume will change into a yellow outfit and gain the ability to use two Keyblades (you can select Master Form's Keyblade through Sora's equipment in the item menu). In Master Form, you'll have increased strength and magic, and can use magic to hold one of your Keyblades. Unfortunately, you can't have any one in your party until you go out, and your drive gauge goes down (If the drive gauge runs out when the number is on zero, you will automatically change back to Standard Form). Picking up one small Drive Orb gives your Master Form 1 EXP while picking up a big one gives 3 EXP, which is needed to level it up. You'll get this Form from King Mickey once you meet him in Hollow Bastion.

Wisdom Form

When you merge with Donald to go into Wisdom Form, your costume will change into a blue outfit, extends the length of your Keyblade, lets you glide along the floor, and change you attack command to shoot. In Wisodm Form, you'll have increased magic, more powerful version of your spells, and the use of magic in rapid succession. Unfortunately, Donald won't be in your party until you go out, and your drive gauge goes down (If the drive gauge runs out when the number is on zero, you will automatically change back to Standard Form). Defeating one Heartless gives your Wisdom Form 1 EXP, which is needed to level it up. You get this Form from Merlin after you stopped the real Pete at the Timeless River world.

Valor Form

When you merge with Goofy to go into Valor Form, your costume will change into a red outfit and gain the ability to use two Keyblades (you can select Valor Form's Keyblade through Sora's equipment in the item menu). In Valor Form, you'll have increased strength and speed, and more attacks in each of your combos. Unfortunately, you can't use magic, Goofy won't be in your party until you go out, and your drive gauge goes down (If the drive gauge runs out when the number is on zero, you will automatically change back to Standard Form). Dealing one hit to an enemy gives your Valor Form 1 EXP, which is needed to level it up. This is the first Form you'll get in the game when the Drive Gauge becomes available to use.

Standard Form

This is Sora's basic Form, since your always in this form when your not performing a form change. It has no harmful side effects and has no set abilities for you to use.