A Devillious. That was what Zakai was; a specific type of demon hunter who hunted devils.

An Ark. The protecter of you, an angel. That was what Zakai was.

A half-devil, and the son of Lucifer, no less.

A mystery. That's what Zakai was, even to you. You didn't know him fully, no thanks to his avoidant and snarky behavior.

In the Pit, essentially a sparring arena, there stood Zakai, a Furrous Sword in his hand.

"Sage. Just gonna stand there and watch?"