Citra Terranova/Scythe Anastasia

A teenager who is recruited to be a Scythe's apprentice in the first book of Arc of the Scythe, and who ends up leading the Scythedom to a more just world by the end of the series. Citra takes the name Anastasia when she becomes a scythe.

Everyone in this future is deliberately mixed race, and the Thunderhead keeps track of peoples' "genetic index". 

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“What’s your genetic index?” he asked—a rather personal question, but perhaps it could have some relevance. “22-37-12-14-15.” He smiled. “Thirty-seven percent Afric descent. Good for you! That’s pretty high!”
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Shusterman, Neal. Scythe (Arc of a Scythe Book 1) (p. 35). Simon & Schuster Books for Young Readers. Kindle Edition.