Double Form

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

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 resembles a fusion of Light Form and Dark Form, with Light Form on Sora's right side and Dark Form on his left. He wields Oathkeeper in his right hand and Oblivion in his left, unlike Roxas, who does the opposite.

A heart symbol is visible on Sora's sleeves and hood; on the hood, the heart is half in black on Sora's left side, and half outlined in silver on his right side. While the coat largely resembles Light Form, the left sleeve is black. The pants are black on the left and grey on the right, with grey back pockets; white kanji are imprinted on the front of each pant leg, with the kanji for "darkness" (闇) on the left side and the kanji for "light" (光) on the right side. 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.

Mechanics
Double Form is the second Formchange of the Oathkeeper and Oblivion Keyblades, following Light Form and Dark Form respectively. Its 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.