His name is ken yeager. As a kid he got injected with the blood of the warhammer titan. He got injected with the blood of the warhammer titan because his family was attacked by the beast titan so he got they serum to protect his family. He trained to join the survey corps and he secretly trained his titan form. After five years of training, he finnaly was a survey corps member. He is 5"7 and he has brown eyes and a sandy colored face with black and gold outfit.
