Ariana Grande as Arianna Morningstar-Mikaelson
"They abused her Nik. I've missed 6 years of her life and couldn't stop it from happening."
Adopted sister-Elena Gilbert, Adopted brother-Jeremy Gilbert, Biological father-Lucifer Morningstar, Biological Uncles-Amenadiel and Michael, Half sister-Aurora "Rory" Decker-Morningstar, Stepmother-Chloe Decker-Morningstar, Stepsister-Beatrice "Trixie" Espinoza, Husband-Niklaus MikaelsonSister in law-Rebekah Mikaelson, Brother in laws-Elijah Mikaelson, Kol Mikaelson, Finn Mikaelson, Mother in law- Ester Mikaelson, Father in law-Mikael Mikaelson.
Species: Tribrid - Werewolf, witch and vampire
Mckenna Grace as Sophia Rosie Morningstar-Mikaelson
"You're my mummy? Have you come to save me?"
Mother-Arianna Morningstar-Mikaelson, Father-Unknown, Stepfather-Niklaus Mikaelson, Grandfather-Lucifer Morningstar, Grandma-Chloe Decker-Morningstar, Aunts-Rory Decker-Morningstar, Trixie Espinoza and Rebekah Mikaelson, Uncles-Jeremy Gilbert, Amenadiel and Elijah and Kol Mikaelson
Species: Werewolf-witch hybrid
Joseph Morgan as Niklaus Mikaelson
"They won't get away with this, my love. I won't stop until they're all dead."
Species: Original Hybrid - Werewolf and vampire
Rest of the cast as themselves
Lucifer cast as themselves
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Arianna Gilbert - the unloved older sister
FanfictionWhat if Elena had an older sister that was hated by everyone in her family except Jeremy? When the Scooby Doo Gang are about to kill Katherine, they call Arianna, not knowing that that would have consequences. The town of Mystic Falls won't know wha...