Olivia Hayley Gerard is a major recurring character on Legacies, and in The Originals season five also. Olivia is the hybrid daughter of Rebekah Mikaelson and Marcel Gerard. She is the granddaughter of Esther, Mikael, and The Governor. She is the niece of Freya, Finn, Elijah, Niklaus, Kol, and Henrik Mikaelson as well as the grand-niece of Dahlia. She is the cousin of Freya and Mathias' unborn son; Freya and Keelin's son, Nik; Diana and Niklaus's twins, Henrik and Hope Mikaelson; Elijah and Katherine's triplets, Sarah, Derek, and James Mikaelson, Kol and Davina's sons; Xavier and Rylee Mikaelson.
As result of her unique heritage, she is the seventh born vampire-witch hybrid. She inherited her vampire gene from both of her parents while her witch gene came from her mother. Through her mother's vampire legacy, Olivia is vampire royalty.
Her middle is Hayley is after her parents close friend, Hayley Marshall-Kenner, and she takes the surname of her father side.
Olivia is a member of the Gerard Family and the Mikaelson Family.