Dark Form turns Sora's clothes black and grey. The kanji for "darkness" (闇) is visible on his pants and hood.
In Kingdom Hearts III, Dark Form is the first Formchange of the Oblivion Keyblade. With the exceptions of Dark Break in place of Black Hole and the addition of Dark Syphon, Dark Form's mechanics are identical to Light Form. Dark Form's attacks utilize black, indigo, and pale violet particle effects to symbolize the dark element, in addition to summoning diamonds and chains to evoke the Oblivion Keyblade. Filling the situation gauge while in Dark Form allows Sora to Formchange into Double Form OBV.