Castor

"Pfft, we all die eventually, but the only way to survive and strive in this world is to bring the others down. It's a kill or be killed world, and I'm not afraid to do what is right for myself."

When Castor was created during the Protonian construct he was one of the more weaker subjects, but that didn't stop them from climbing up to power. They are extremally deceitful and narcissistic, killing and consuming the souls of other protonians so they can grow up the rank and be more likely to survive 'the purge'. They found Alcyone to be a perfect ally and pawn in his devious acts, planning to start a revolution and destroy the elites and Overseers.