Age: 15
Birthday: July 7, 1838
Gender: Female
Hair color: Blonde
Eye color: Blue
Affiliation: Alzano Imperial Magic Academy (current)
Occupation: Student

Rumia is close to her teacher Glenn Radars, who often treats her well. She is the daughter of Alicia VII and the former princess of the Alzano Empire.

She is a princess whose real name is Alumiania who was rumored to have died in the past years. But in fact, she actually was banished for being a "supernatural," and was taken in by the Fibel family.

Three years prior to the story, Glenn unknowingly saved her when she was kidnapped.