Duchess

Duchess works as a scientist for The Rebellion and helped Harmony and friends during The Battle of Slovakia on 3/23/19. There she had gained the tracing pass and gave it to Harmony so she would use it for the good of the multiverse.

Inventions
Duchess has had a long history of great inventions that help the rebellion with the revolution, but her most useful invention would have to be The Multiverse Observer: A computer that records what's happening in the other universes and can even let the user communicate with people from the other universes.