Charlotte

Princess, プリンセス

The niece of the Duke of Normandy and a princess from the Kingdom of Albion, she's fourth in line to the throne. Despite her unusual character traits, she is friendly towards others.

Spoilers:

During episode 8 it is revealed that Ange, the current "Princess" was switched with the real princess when the revolution started. Thus, she had to learn all the etiquette and mannerisms of being a princess on her own and adopted the role of "princess" in place of Charlotte. She knew Ange from ten years ago. She works with Ange in hopes that Ange will help her ascend to the throne. Her true name is Ange.