Zeke Jaeger, son of Grisha Jaeger and Dina Fritz, is Eren Jaeger’s older half-brother through their shared father. Born with royal Eldian blood via his mother’s lineage to the Fritz monarchy, Zeke was groomed by his Restorationist parents in Marley to infiltrate the Warrior Program and advance their rebellion. Their neglect and single-minded devotion to Eldian liberation bred resentment in Zeke, culminating in his betrayal of Grisha and Dina to Marleyan authorities—an act that condemned them to eternal existence as Pure Titans. As inheritor of the Beast Titan, Zeke wielded a 17-meter simian form capable of hurling devastating projectile attacks and commanding Titans through spinal-fluid serums. Renowned as Marley’s most formidable Warrior, he executed ruthless strategies against Paradis Island, transforming Ragako villagers into Titans and orchestrating the Shiganshina ambush that decimated the Survey Corps. Though his tactics radiated cold precision, glimpses of empathy surfaced in his conflicted remarks about Paradis civilians ensnared by fabricated histories. Shaped by childhood abandonment and Marley’s systemic indoctrination, Zeke viewed Eldians as cursed to endless bloodshed. His euthanasia scheme sought to sterilize all Subjects of Ymir using the Founding Titan, a plan requiring alignment with Eren, whom he aimed to “rescue” from Grisha’s ideological grip. Their alliance shattered when Eren’s true intent—the Rumbling’s global genocide—emerged, exposing Zeke’s miscalculations and Eren’s manipulation of their father to slaughter the Reiss family. Beneath his strategic detachment lay emotional complexity. His bond with Tom Ksaver, a prior Beast Titan holder, offered rare solace, with their shared baseball symbolizing fragile moments of peace amid existential burdens. Though Zeke yearned for kinship with Eren, their clashing philosophies severed tentative ties, leaving him isolated in his final hours. During the Rumbling’s climax, Zeke transitioned from architect of extinction to sacrificial figure. Decapitated by Gabi, his consciousness entered the Paths dimension, where he futilely urged Ymir Fritz to enact sterilization before Eren’s will prevailed. Accepting defeat, Zeke triggered his own death to disrupt the Titan curse, finding fleeting clarity in a memory of playing catch with Ksaver—a quiet acknowledgment of life’s fragile worth. His arc intertwines inherited trauma, the perils of ideological extremism, and an existential search for purpose, framing violence as both legacy and prison. Zeke’s choices, driven by a warped compassion to end suffering, mirror the series’ interrogation of morality amid cycles of vengeance and despair.