Gust has a downloadable content pack planned for Atelier Totori, which makes Totori’s popular sister a playable character. While Cecilia is in Atelier Totori, you couldn’t add her to your party.
The downloadable content pack also adds a character model viewer and an option to change the game’s background music. Songs from other Atelier games will be included in the in-game jukebox.
A release date was not announced for the pack.