Twilight Change! (トワイライトチェンジ！Towairaito Chenji!) is the transformation phrase used by Princess Akuma. It requires no transformation item.
Akuma's eyes change from purple to green, then she shouts "Twilight Change!", and she spins around as her dress is formed. There is a small explosion of white light and spins as extra parts of her dress appears, then she says her introduction before striking her pose.