Bertholdt Hoover was an Eldian Warrior from Marley and the inheritor of the Colossal Titan, one of the most destructive Titans in existence. He originated from Liberio’s internment zone and was selected as a child to become one of Marley’s Warriors. In the year 845, he infiltrated Paradis Island alongside Reiner Braun, Annie Leonhart, and Marcel Galliard during the operation to reclaim the Founding Titan. He later joined the 104th Cadet Corps, graduating 3rd in his class, and became a member of the Scout Regiment until his identity was exposed.

Bertholdt was an exceptionally tall and slender boy, towering above his peers in the 104th. He had short black hair, pale green eyes, and an elongated face, often appearing timid and nervous. He was frequently seen sweating, a nervous habit that symbolized his anxious nature. In his Colossal Titan form (60 meters), he became the tallest Titan at the time, with a terrifying, skinless appearance. His Titan constantly released scalding steam, and its disproportionate limbs and massive size made it capable of overwhelming destruction.

Bertholdt was generally quiet, reserved, and insecure. He lacked initiative and often followed Reiner’s lead, admitting himself that he had a weak will. Despite this, he was deeply loyal to his comrades, particularly Reiner and Annie, showing protectiveness whenever they were threatened. Though he seemed emotionally detached, Bertholdt struggled with guilt and inner conflict, torn between his duty to Marley and his friendships within the 104th. Later in the story, he hardened into a colder, more resolute figure, accepting his role as a Warrior even if it meant destroying his former comrades. 

Childhood: Born in Liberio, Bertholdt trained as a Warrior candidate and quickly stood out due to his height and potential. He befriended Reiner after defending him from Porco Galliard’s bullying, forming a lifelong bond.

Becoming a Warrior: He inherited the Colossal Titan, mastering its devastating power early on.

Paradis Mission (845): Bertholdt breached Wall Maria, marking the beginning of humanity’s downfall inside the Walls. Alongside Reiner, Annie, and Marcel, he continued the mission after Marcel’s death.

104th Cadet Corps: He joined the 104th as cover, ranking 3rd. Despite his quiet nature, he bonded with his comrades, though he always remained conflicted.

Revealed as the Colossal Titan: Once exposed, Bertholdt embraced his duty, showing a colder resolve during the Battle of Shiganshina, where he unleashed the full power of his Titan against his former friends. Ultimately, he was defeated and devoured by Armin, who inherited the Colossal Titan.