Arche Kouzuki - birth name Arche vi Britannia. She is the only daughter of Kallen Kouzuki and Lelouch vi Britannia, the late Emperor of the Holy Empire. Born a year after the events of the Zero Requiem, she was the result of a night of passion between Kallen and Lelouch, she inherited her father's intelligence and looks while inheriting her mother's Knightmare piloting skills, achieving a perfect sync score with the Sylph, the 11th-Generation Knightmare.
Lelouch vi Britannia - the 99th Emperor of the Holy Empire, and the original leader fo the Black Knights. To the people, he was seen as a malevolent dictator, cold-hearted and ruthless as he punished any that dared to defy him. He is also the father of Arche Kouzuki.
Kallen Kouzuki - known as Kallen Stadtfeld at Ashford Academy, she is the ace pilot of the Black Knights. Kallen's love for Lelouch resurfaced, and after taking the throne, shared a night of passion with him. The result was her being pregnant with their child, who was born a year after the Zero Requiem.
Cecaniah - more well-known as C.C., she is an immortal woman who has lived for an untold number of years, possibly since the early years of Britannia. She is one of the few people that is vulnerable to Arche's Geass, despite bearing a Code.
Chester - Arche and Chester have a volatile relationship. The two snipe at each other and trade insults, but at the core of it is a friendship, perhaps even a hint of romance, that neither will admit to. Far in the future with all her original friends dead, Arche laments Chester's passing the most.
The 11th-Generation Knightmare, considered to be the child of the Lancelot Albion and the Guren S.E.I.T.E.N by Rakshata Chawla and Lloyd Asplund. It is the personal Knightmare of Arche Kouzuki.
The brother unit of the Lancelot, initially piloted by defection towards the Black Knights. The personal Knightmare of Chester.
The first-ever Japanese designed Knightmare Frame, as well as Kallen Kouzuki's personal unit. Like the Sylph, it is equipped with a Radiant Surger, however it was stronger than the Sylph.
- Arche Kozuki, is based on Arche Klein, A protagonist in the Video Game, Tales of Phantasia.