Bertholdt Hoover, a member of the 104th Cadet Corps, was an Eldian raised in Marley’s Liberio internment zone and trained as a Warrior candidate. Infiltrating Paradis Island in 845 alongside Reiner Braun, Annie Leonhart, and Marcel Galliard, he carried the Colossal Titan’s power with the mission to reclaim the Founding Titan by destroying humanity’s Walls. Marcel’s death during their infiltration—sacrificed to save Reiner from Ymir’s Titan—left an enduring mark on him. Towering over his peers, Bertholdt’s quiet, withdrawn nature and frequent nervous sweating masked a fragile self-perception. Though plagued by self-doubt and a tendency to follow others’ lead, he maintained unwavering loyalty to Reiner and Annie, forging bonds tangled in duty and shared trauma. His interactions with Eren Jaeger, Armin Arlert, and others in the 104th exposed a duality: a soldier torn between Marley’s demands and the guilt of betraying those he fought alongside. In his 60-meter Colossal Titan form, Bertholdt unleashed devastation with searing heat and steam, his skeletal frame symbolizing humanity’s ruin. His breach of Wall Maria triggered the collapse of Shiganshina, slaughtering thousands, including Eren’s mother. Five years later, he shattered Wall Rose in Trost, deepening Paradis’ crisis. While justifying these acts as necessary for Marley, he privately grappled with their horrific cost. Ranking third in the 104th’s training, Bertholdt demonstrated skill with vertical maneuvering gear, even aiding Eren with equipment repairs—a fleeting glimpse of camaraderie. His role in Marco Bodt’s abandonment, however, laid bare his struggle between obligation and conscience, leaving him visibly haunted by the act. The Battle of Shiganshina hardened Bertholdt’s resolve. Shedding hesitation, he coldly declared his intent to annihilate the Walls’ inhabitants, resisting Armin’s psychological tactics invoking Annie. Yet Armin’s cunning strategy during their clash unraveled his defenses. Forced into his Titan form, Bertholdt ravaged the battlefield until Armin’s sacrificial maneuver enabled Eren to overpower him. Stripped of his Titan, he reverted to trembling vulnerability, begging for salvation as Armin’s Pure Titan consumed him, transferring his power. Bertholdt’s legacy endured through Armin, who inherited both the Colossal Titan and the ethical ambiguities it embodied. His ties to Reiner and Annie echoed themes of fractured loyalty and ideological strife, while his fate underscored the relentless cycle of violence perpetuated by Titan power inheritance.