She can transform into Towa, which gives her a different set of attacks. Toki specializes in long range combat while Towa uses close range attacks. Changing between the two characters requires pepper. Towa has a different voice actress too. Eri Kitamura, Finnel in Ar Tonelico Qoga and Juliet Starling in Lollipop Chainsaw is Towa.
While the PlayStation 3 game is literally called Time and Eternity when translated into English, it can also be read as Toki and Towa. "Toki" being the character for time and "Towa" is the character for eternity. Imageepoch often abbreviates the title to Tokitowa.