Double Form

Double Form is a Formchange in Kingdom Hearts III, triggered by the Oathkeeper and Oblivion Keyblades. It transforms Sora's clothes into a fusion of Light Form and Dark Form, and allows him to dual-wield Oathkeeper and Oblivion and harness the powers of both light and darkness.

Oathkeeper and Oblivion's Formchanges are nominally different: Double Form OKP (ダブルフォームY) for Oathkeeper, and Double Form OBV (ダブルフォームS) for Oblivion.

Design
Double Form allows Sora to wield Oathkeeper in his right hand and Oblivion in his left, though he will wield the Keyblade that triggered the Formchange in his right hand whenever he has to use just one. His clothes transform into a fusion of Light Form and Dark Form, with Light Form on his right side and Dark Form on his left. The coat largely resembles Light Form, with the left sleeve being black. The sleeves have three heart symbols in a vertical row, being black on the left sleeve and silver on the right sleeve. The hood also has a heart symbol; the left half is black, while the right half is in silver. The pants have grey back pockets; the left side is black with the kanji for "darkness" (闇) on the front in white, while the right side is grey and has the kanji for "light" (光) on the front in white. The shoes are a fusion of Light Form and Dark Form's, with white collars, black toe boxes and heels outlined in white, and grey vamps and quarters. Double Form alters Sora's appearance in other worlds:


 * In his Toy Box form, his jacket is mostly white with black shoulders, gloves, and pockets. His pants are grey with white pockets, and his shoes are white and black.
 * In his Monstropolis form, his jacket is black and grey with white sleeves and pockets. His fur is grey with alternative white and black stripes, while his hair is black with white tips.
 * In his The Caribbean form, his coat silver has white cufflinks. The insides of his coat are white on his right side with the kanji for "light" (光), and black on the left with the kanji for "darkness" (闇). His undershirt is black on his right side and white on the left. His hat has a heart on it.

Mechanics
In Kingdom Hearts III, Double Form OKP is the second Formchange of the Oathkeeper Keyblade following Light Form, while Double Form OBV is the second Formchange of the Oblivion Keyblade following Dark Form. Double Form's fighting style is very similar to Roxas's fighting style.

The Finish command has Sora raise Oathkeeper and Oblivion skyward before changing the background to a sky at dawn. He generates a giant sigil beneath him before generating pillars of light to ravage the enemy.

Strategy
Double Form is an ideal late-game Formchange. Though it doesn't quite match up to the immense damage output of Ultimate Form, Double Form is a viable alternative due to allowing Sora to stay in Form for longer, with Double Form acting as a secondary Formchange after the duration of Light or Dark Form. Combined with high single target damage output, high mobility, and solid defensive options, Double Form is optimal to use for many tough boss fights.

Some caution should be used when in Double Form, as the final combo finisher Mirage Thrust's long animation can cause Sora to become vulnerable in the event of an enemy counterattack. It's advised to keep this in mind for enemies that will counter at the end of a combo.