Morgan le Fay

is the sister of King Arthur and mother of Mordred.

Background
Morgan was born as the proper, recognized daughter of King Uther. Although the older sister and of the same status, Artoria received the love and hopes of their father in Morgan's eyes, driving her to eventually become a witch queen who craved for vengeance for the rest of her days. During Artoria's training, Morgan executed a trap, and due to Merlin's womanizing, Artoria was caught up in it and lost Caliburn. Once Camelot was built, she went into seclusion. She sent Agravain as an assassin. She was a fairy of the lake and the evil polar opposite of Vivian, the Lady of the Lake.

She eventually enchanted Artoria, a pseudo-male at the time due to Merlin's intervention to produce an heir, and extracted sperm from Artoria to develop as a homunculus clone within her ovary. Mordred was soon born and aged rapidly, and Morgan raised her in secret while telling her of her right to the throne. She told Mordred to never remove her helmet and recommended her to the Round Table. She directed Mordred to hide her status and obey the King until she could defeat Artoria and take her place. While Mordred was initially idealistic and served as a proper knight, Morgan shattered her innocence with the truth of her birth to guide her towards the path of rebellion.

Personality
Morgan greatly hates her sister and possesses a great obsession for Mordred to take the throne from her. She changed greatly throughout her life from a "fine lady" to a "frightening thing" according to Kay, and he describes it as if she had three women inside of her. Having started with the "innocence of a fairy", she became "as magnificent as a warrior maiden", and "then suddenly possessed the brutality of a witch." Kay believes she may have had similar burdening circumstances as Artoria due to their parentage.

Garden of Avalon
Morgan is mentioned in Kay's story and Lancelot's story.

Other appearances
Morgan is reflected in the form of Excalibur should it become tainted with evil, becoming Excalibur Morgan. Mordred mentions in Fate/Apocrypha that Semiramis, an evil schemer, possesses the same "smell" as Morgan.

Abilities
Morgan is a powerful witch queen said to be the equal of Merlin and ruler with immense power. Although unexpected, Morgan was born with supernatural blood that was thought to have died with Uthur. She was the legitimate owner of the British Isle, a greater “King of the Island” than her sister. Despite that, she proved to be nothing more than a "small pebble" on the path of Artoria, unable to do anything to injure Artoria's heart. Morgan possesses the ability to enchant Artoria and create the homunculus clone Mordred.