LEONARD TESTAROSSA SPOILER!

Tessa’s twin brother and a major player in the shadowy terrorist syndicate known as Amalgam. Like his sister, Leonard is a "Whispered," but his grasp of black technology far exceeds almost anyone on the planet. With his silver hair, smooth-talking demeanor, and profound nihilism, he represents the ultimate ideological threat to both Mithril and Sosuke's protection of Kaname. He is the brilliant, tragic prodigy who chose to embrace the darkness of his own mind.