Mercedes

Early Life
Born a noble in the Adrestian Empire to Baron Martritz, Mercedes' house was abolished when her father died in the year she was born. Her mother remarried Baron Bartels, and they had a son named Emile a year later, who bore a Crest. However, this proved to be her and her mother's undoing, as both began being treated as if they were expendable since her stepfather solely wanted a child with a Crest. Thus, in 1167, at the age of 10, she and her mother left House Bartels to live in a church in eastern Faerghus.

Mercedes was eventually adopted by a merchant from Fhirdiad and grew up as a commoner, though her adoptive father wanted her to marry well and have a child with a Crest. Before attending the Officers Academy, she attended the Royal School of Sorcery in the capital and befriended Annette.

Sometime after leaving House Bartels, Baron Bartels desired to have another child with a Crest to expand his influence. He eventually decided on Mercedes as their mother because she was of childbearing age, along with the fact that she had a minor Crest of Lamine, eventually learning where they were hiding. Mercedes was not aware of this, as Emile killed him before he could do anything.

Academy Phase
Mercedes enrolled in Garreg Mach Monastery Officers Academy in Imperial Year 1180 and joined the Blue Lions. She is slightly older than the other students and even Byleth. She is a close friend of Annette, whom she met at the school of sorcery. Mercedes and Annette both joined the Black Eagle House somtime before the war started.

War Phase
in Imperial Year 1181, she returns home to the Kingdom capital and helps with the merchant business. In 1185, she joins the Black Eagle Strike Force at Garreg Mach.

After the war Mercedes moves to a village to run an orphanage. Altough Mercedes and Annette where far apart their love kept them to gether. After many years Annette moved in with Mercedes where they lived the rest of their life. Altough they never married they still loved each other more than anything in the world.

Ending Quote
"After the war, Annette and Mercedes lived separate lives: the former as a teacher at the school of sorcery in Fhirdiad, the latter as the proprietor of an orphanage in a village in the ex-Faerghus region. Though they lived apart, they exchanged letters so frequently and shared their lives with one another in such detail that it was as though they were side by side. After many years, Annette decided to resign from her post and move in with Mercedes to help run the orphanage. The life they lived there was modest, but it is said that they were happy to the very end."