Musse Egret

Musse is a young woman with olive-green hair, with what appears to be short hair.

In her debut, Musse is shown to be playful and quite teasing, often messing around with Rean Schwarzer, much to his discontent. She continues to maintain this personality around him even after her intentions were exposed; despite this, she does admit that she prefers his type.

She is also a tactical genius, being able to quickly analyze the situation at hand, either formulating a plan well in advance or improvising on the go in an emergency. She dislikes relying on others and miracles, considering the latter dangerous to her planning. Likewise in battle, Musse prefers staying in the back, analyzing her opponents and supporting her allies with arts.

She appreciates Eastern culture, most likely passed down from her mother, as the kimono she wears was originally a keepsake from her and she enjoys tea ceremonies.

Musse was born in western Erebonia as the daughter of Alfred de Cayenne and his wife, the daughter of Count Theodore and Suzanne Egret. During this time, she met Archduke Albert von Bartholomeus, who was a friend of her father's, as well as his niece Lif, who became a friend of hers. She lost her parents in a maritime accident when she was 6 years old, after which she lived with her grandparents.

With her father dead, Alfred's brother Croire inherited the title of Duke Cayenne and transferred Musse to Heimdallr, where she would be entrapped in St. Astraia Girls' School's elementary courses for the next 10 years of her life. She became acquainted with Elise Schwarzer and Alfin Reise Arnor. She dropped out soon after the Erebonian Civil War. During this transition, Mildine changed her name to Musse, the pet name used when she was still a child.

Following her uncle's arrest, Musse contacted Aurelia Le Guin who had been an acquaintance of Count Egret since childhood and demonstrated her ability by informing the general of both the Northern War and the imperial government's proposal. This demonstration convinced Aurelia that Musse should inherit the title of Duchess Cayenne instead of the greed-driven Wilhelm Ballad. By this point, Musse had also already reached out to Vita Clotilde.

Gifted to see the current political situation within Erebonia like the pieces of a chessboard, she was able to predict the possibility of the National Mobilization Law, the war with Calvard and the spread of Erebonia's curse by the end of S.1205.

Musse's strategy against Osborne's schemes were twofold. The first was to ensure the position of principal at newly instructed campus would be filled by Aurelia. The second was to claim the seat as Duchess Cayenne and secretly gather volunteers for the Weissland Army, which would start its operations after the start of the Great Twilight. She decided to call the plan Mille Mirage.