Guinevere

Empress Guinevere, also known as Guinevere the Arthur, is the eldest daughter of Emperor Lancelot and his wife, Empress Elaine, elder sister of Mordred. Despite the succession laws being absolute cognatic, she was overthrown by a coup led by her own younger brother and forced to flee, starting a rebellion to restore her rightful place as Empress of the Arthurian Empire.

Guinevere is well versed in politics and proper stewardship as part of her parent's education to succeed them, but was often viewed as too "charitable" in her rulership. It was known amongst the masses that she would have been a proper Empress if not for her brother's coup, as she was the one who managed to repair relationships between the elves and the humans as well as bury the hatchet between several rival families.

Background
Guinevere is the eldest daughter and next in line to become the ruler of the Arthurian Empire. She had a younger brother, Mordred, whom she wasn't friendly with due to his cunning and lustful reputation. Guinevere enjoyed proper "lady-like" luxuries in the capital but often times gained a reputation as a "giver" as she was known to donate much money to charities, which, unknown to her, gained many enemies in crime rings and corrupt politicians who wanted to exploit the poor. She also established an order of over a thousand knights, known as the Silver Hand, compiled of mostly female knights, to act as her personal bodyguards.

After her father's death, her own younger brother deposed her in a coup, stating that it should be a "true son of Arthur" to lead the people of the Arthurian Empire, she was forced to flee to the city of Guinevere, the second largest city in the Arthurian Empire, starting the Arthurian Civil War in an effort to take her rightful place as Empress of the Arthurian Empire. Whilst things were going well in the first phase, Mordred's Imperial Army proved too well organized against her feudal supporters, making way for a clear victory.

Recent History
After an army of Germans emerged from the Gate, she was one of the first to make contact with them by sending an envoy after hearing of how they destroyed an entire army of Mordred's forces. After the message was received, her brother led an army of over 300,000 to lay siege on her capital city, intending to end the war immediately to fight the Germans. Only a week into the siege, an unexpected turn of events happened when an army of thousands of German soldiers attacked to besieging army, along with hundreds of paratroopers being landed within the city. She personally bared witness to the Luftwaffe dropping bombs onto the army outside her city.

Trivia

 * She is likely based upon Puyi, the Last Emperor of China, who ruled Manchukuo as a puppet and had his power relied entirely on Japan for his claim to the throne.