Zeke Yeager

Grisha's elder son, a Marleyan Warrior and holder of the Beast Titan: with royal blood and his spinal fluid he turns Eldians into Titans with a scream. He dreams of making the Eldians die out painlessly.

At seven he turns in his parents to save himself, and finds a father in Tom Ksaver, who reveals the truth about the Titans to him. He becomes the Warriors' chief and their ace: at Ragako, at Wall Rose and at Shiganshina he leads the Titans, kills Mike and decimates the Survey Corps. In secret, though, he works with Yelena on a plan opposed to Marley's: reach the Coordinate with Eren and use the Founder to make every Eldian sterile. Eren betrays him. During the Rumbling, in the Paths, Armin shows him the value of life; Zeke lets Levi kill him to stop the Founder.