Lancer

Lancer, known as Strange Tail Girl in the original promotional materials, is an enemy Servant in the Moon Cell Holy Grail War in Fate/Extra CCC.

She is unique in that she switches between four different Masters as a Lancer-class Servant, Rin Tohsaka, Rani VIII, Shinji Matou, and Hakuno Kishinami, and she later acts as the Berserker-class Servant of Meltlilith.

Her identity is Elizabeth Bathory. She is given the keyword "Dragon's Daughter," related to her nickname "Countess Dracula."

Elizabeth Bathory was originally summoned by Run Ru as a Lancer class Servant but after BB assassinated Run Ru, Lancer choose to willingly collaborate with BB.