Mordred Pendragon
モードレッドThe Knight of Treachery / Saber of Red / Aka no Saber
Biography
Mordred is the "son" of King Arthur though, in reality, she is a woman.
Morgan le Fay, Artoria's sister, created Mordred as a homunculus clone of the King. Morgan grew Mordred in secret, inculcating her the desire to usurp the King and ascend to the throne as the rightful heir. To achieve this objective Mordred was made to be one of the Knights of the Round Table.
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With time Mordred grew to idolize her "father", but the King refused to recognize her as a rightful heir. These clashing feelings of love and hate made Mordred play an important role in the fall of Camelot.
In Fate/Apocrypha:
Story spoilers
Mordred is the Saber-class Servant of Kairi Shishigou as part of the Red Faction in the Turifas Holy Grail War.
Anime appearances
Fate/Grand Order Divine Realm of the Round Table: Camelot - Wandering; Agateram
supporting
Movie / 2020