Kai Parker

Kai is an openly sadistic warlock, despite a thinly veiled facade of charm. Kai is openly unrepentant and proud of how evil he is.

Malachai "Kai" Parker is a major antagonist in the Vampire Diaries franchise, serving as the main antagonist of Season 6, the overarching antagonist of Season 7, and a major antagonist in Season 8. Kai also served as a minor antagonist in Season 2 of The Vampire Diaries’ spin off series Legacies. He is a young warlock with the unnatural power to siphon magic. Because of this power, Kai was considered an abomination by his family, as he is practically a parasite for magic. This lead to him murdering his siblings.

Kai Parker was born to the Gemini Witch coven, along with his twin sister Josette. The Gemini's can only survive with a leader, and they pick their leaders with a merge ritual; in which twins ritualistically fuse their magic, one of them dies (but their soul gets fused with the winner) and the other becomes more powerful in addition to being the leader. Because of Kai's siphoning power, he had an unfair advantage, so his parents kept having children until another set of twins named Luke and Liv were born.

Angry at being denied his destiny, Kai goes on a murderous rampage killing his other siblings until it was down to him, Jo, Luke and Liv. When Kai corners Luke and Liv in their bedroom, Jo comes to their rescue, agreeing to do the merge ritual with Kai. This turns out to be a ruse to get the other Gemini's to trap him in a prison world. In said prison world, Kai lived the same day in 1994 in a desolated world.