Second Form

Second Form is a Formchange in Kingdom Hearts III. It grants Sora clothing based on his outfit from Kingdom Hearts II and gives him access to familiar abilities. It is triggered by the Kingdom Key, Starlight, Midnight Blue, Phantom Green, and Dawn Till Dusk. The Keyblade determines the name of the Formchange. The Kingdom Key, Starlight, Midnight Blue, Phantom Green, and Dawn Till Dusk refer to their formchanges as "Second Form", "Second Form S", "Second Form M", "Second Form P", and Second Form D", respectively. The only difference between the sub-forms is the third-level finisher.

Appearance
Second Form changes Sora's clothes into the same colors and style of the clothes he wore in Kingdom Hearts II. While wearing his original outfit during the Olympus episode, Sora's clothes do not change. In addition, when using the max-level Shotlock, Sora's clothes will also briefly change to his Kingdom Hearts II style, even when not in Second Form.

Mechanics
Second Form grants Sora several of his abilities from Kingdom Hearts and Kingdom Hearts II that are otherwise unusable outside of the Formchange. The third-level finisher for Starlight replaces Ars Arcanum with Ancient Light.