Augusta Frederica Adel-Adler (アウグスタ・フレデリカ・アデルアドラー, Augusuta Furederika Aderuadorа̄?), currently under the name Frederica Rosenfort (ローゼンフォルト, Rо̄zenforuto?), is the Mascot of the Nordlicht Squadron and the last empress of the former Giadian Empire. She has the ability to see the past and present of a person known to her.
Frederica has the bloodred eyes of a Pyrope and the jet-black hair of an Onyx. Due to her occupation as a Mascot, her outfit consists of a child-sized version of the Federacy's military uniform, substituting the steel-colored jacket for a beige one. She occasionally wears a beige flight cap emblazoned with the Giadian emblem.
Frederica is haughty and outspoken, as she had been raised to be the next in line for the Giadian throne. She articulates her speech maturely for someone her age, which often rubs others the wrong way. She is not afraid to argue her point and occasionally breaks protocol to get her way, such as when she snuck aboard Shinei's transport during a sortie. When she was younger, she participated in boyish activities such as tree climbing, much to her knight's chagrin.
Due to her Pyrope heritage, Frederica can see the past and present of a person known to her, a useful ability to have when extracting personal information or searching for MIA combatants. Though her powers have the disadvantage of only showing images without sound so the information can be rather limited.
Kiri was Frederica's personal knight, she seemed to rely heavily upon him as an older brother figure. Her attachment to him became a burden upon her once Kiriya died and was assimilated by the Legion into the railgun-type Morpho. She was able to let go of her lingering feelings and regrets towards him come the Morpho's elimination by the Nordlicht Squadron.
Frederica sees Shinei as an older brother and substitute for Kiri. She grows an attachment to him similar to that with her knight. Due to her regrets with Kiri, she frequently whishes to be at Shinei's side, even when he would rather not. Her view of him would later evolve from being Kiri's substitute to a separate person that was still her older brother. She is one of, if not the only person to call him Shinei instead of Shin.