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In The Vampire Diaries, we see a lot of supernatural things like vampires, werewolves, witches, doppelgängers and even hybrids. But what I don't get is why Klaus needs a doppelgängers blood to make hybrids and why he can't just use someone else's blood. And how come once the person is a vampire you can't use their blood anymore? They have to be human and a doppelgänger?

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  • It was Klaus' mother's trick.. To break the curse, Klaus needed to kill Doppelganger, but then a Doppelganger's blood was required to create hybrid. Klaus' mother wanted to make sure that Klaus wouldn't be able to create his hybrid army, but the things didn't play out her way..
    – user931
    Nov 18, 2018 at 11:07

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To break the curse, Klaus needed to sacrifice a Doppelgänger, but they tricked him and saved Elena.

Now Elena is the missing key to create a hybrid, that's why Klaus needed her blood. Katherine's blood can't be used, as she is a vampire now. That curse required to sacrifice one vampire, one werewolf and one Doppelgänger. Now adding Katherine to the mix will mess up the equation.

Why a vampire Doppelgänger can't be used was never made clear. Maybe when a Doppelgänger becomes a vampire his Doppelgänger status become nulled.

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Klaus needs Elanas blood cause she is the doppelgänger and Klaus needs to sacrifice a doppelgänger to break the curse. He tried using Katharine's blood but she was able to get away and turn herself making her vampire and klaus can only use a doppelgängers blood as long as he/she is human. Her blood is also key to making more hybrids.

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  • I feel like I straight just copied @AnkitSharma answer. Sorry. If they look to similar go head and delete my answer :)
    – Totally a rebel
    Jun 27, 2016 at 3:56

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