Niklaus "Klaus" Mikaelson is the protagonist of The Originals. He is a former main character, antagonist/anti-hero of The Vampire Diaries. Klaus is an Original vampire and a werewolf, making him theOriginal Hybrid.He is the maternal half-brother of Elijah Mikaelson, Rebekah Mikaelson, Kol Mikaelson and Finn Mikaelson, Henrik Mikaelson andFreya Mikaelson.
Rebekah Mikaelson is a former Original Vampire and the younger daughter of Mikael and Esther. She is the younger sister of Freya Mikaelson, Finn Mikaelson, Elijah Mikaelson, Niklaus Mikaelson andKol Mikaelson, the elder sister of Henrik Mikaelson, and the aunt of an unnamed nephew and Klaus' child with Hayley Marshall, Hope Mikaelson.
Elijah Mikaelson is the deuteragonist of The Originals. He was formerly a major recurring character in The Vampire Diaries, serving initially as an antagonist in the second season and eventually becoming a supporting character in the third season and fourth season. Elijah is an Original Vampire.