Age: 16
Birthday: December 30
Height: 192 cm (6'3")
Weight: 81 kg (179 lbs)
Affiliations: Scouting Legion
Graduation Rank: 3rd

He originally joined the military with aspirations of joining the Military Police and living in the safety of the inner wall.

After seeing Eren's determination and desire to join the Scouting Legion, he considered himself a coward for wanting to get far away from them. Eventually he graduated in the top ten of his class coming in at third place, and joined the Scouting Legion.

Major spoiler: Later it is revealed that he is the Colossal Titan who broke through Wall Maria and infiltrated the walls as a spy.
Note: Bertolt Hoover is the official English translation by Kodansha.