Bertolt Hoover

Bertolt Hoover (Berutoruto Fūbā?) is a graduate of the 104th Trainees Squad and former member of the Survey Corps. He ranked 3rd, and is described by others as a weak-willed and quiet person. He is rarely seen without Reiner Braun, his close childhood friend, both of whom originate from their mysterious "Homeland" outside the Walls. Along with Reiner and Annie Leonhart, he is a person that possesses the ability to transform into a Titan and serves as an as-yet unrevealed group. In the year 845, he was on a mission with Reiner to breach Wall Maria and infiltrate the Military in search of something that Reiner refers to as the "Coordinate". As the Colossal Titan, he serves as a major antagonist. However, the revelation of his true identity illustrates the moral uncertainty of the series.

Bertolt is a rather tall, slender young man. He is the tallest of all currently known Titan Shifters, both in human and Titan form, and one of the tallest characters in the series, his Titan form only being outmatched by the abnormal Rod Reiss. He has short, dark hair, brown eyes, thin eyebrows and an elongated face. In the anime his eyes are green. He is seen mainly in his Trainee uniform, and after he enters the Survey Corps, he uses their uniform. After his encounter with the Beast Titan, his hair appears shorter.

Bertolt is a quiet, young man, identifying himself as someone with a weak will that follows popular opinion. Likewise, their instructor noted him to be a person with great potential, but an utter lack of initiative. He is further described by Eren as being taciturn, and tends to remain in the background unless necessary. By his own admission, he is something of a coward and is noted for his low self-esteem. His withdrawn behavior initially lead to the impression of him as the least emotionally compromised of the three Titan agents. He showed little attachment or remorse over his actions, seeming to care only about his partner, Reiner. However, when confronted by his former comrades and questioned about their friendship, he reveals himself to be far more conflicted and guilt-ridden than it originally appeared. His claims of not having a choice add a further level of ambiguity to his character, leaving many of his actions in question. He shows great devotion to both of his fellow agents, Reiner Braun and Annie Leonhart, easily driven to action or anger when he feels either is threatened. Initially, he shows himself to be wary of others (for good reason) and acts as a voice of reason to Reiner, cautioning him repeatedly about lowering his guard. His interactions with Ymir reveal that while his actions have caused considerable suffering, he is not a cruel person and is capable of showing genuine kindness towards others.