A mysterious character first introduced in the 1931: The Grand Punk Railroad 2006 manga adaptation by Shijin Ginyuu. Rosetta's most notable trait is her enigmatic nature. Though she at first seems to simply be Jacques-Rosé Boronial's more level-headed girlfriend, the occasional comment and aside glance suggest that she knows more than he is letting on. She also has a cheerful, flirtatious air to her.

Spoiler

Her true nature is that of a 'demon' like Ronny Schiatto, but her personality in that capacity has never been directly revealed.