Mathew Davis, Jenny Boyd, and Quincy Fouse were in Vampire Diaries and also appeared in Legacies.
Some of the main cast members are Danielle Rose Russell as Hope Mikaelson, a rare hybrid of vampire, werewolf, and witch, Jenny Boyd as Lizzie Saltzman, one of Alaric and Caroline’s twins who has magical abilities, and Thomas Doherty as Sebastian, a mysterious vampire who joins the school in season 2
Danielle Rose Russell, Jenny Boyd, Kaylee Bryant, Quincy Fouse, and Aria Shahghasemi appeared in season 2.
Leo Howard is the British guy in the series and, he portrayed the role of Ethan in the series.
Damon isn’t part of the series.
Yes, he was in Legacies.
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