Black Bolt's cousin and adviser, who can see the flaw in anything, including in himself, which is not a comfortable way to live.
Karnak is Black Bolt’s cousin and closest adviser, able to see the fault in all things, which lets him avoid errors and find the weak point in anything. Ken Leung plays him.
The best idea in Inhumans is what it does to him. He is defined entirely by being right, and the series breaks the power early and leaves him to work out who he is without it.