Tom Ksaver was an Eldian researcher and Warrior who held the power of the Beast Titan. He was the mentor and friend of Zeke Yeager.
Ksaver had short dark hair and a round face. He wore the traditional apparel of a Warrior and a red armband, showing that he was an Eldian and an honorary Marleyan. Ksaver also wore glasses that Zeke Yeager would later wear as an adult.
Possessing an inquisitive mind, Ksaver was always curious about how the Titans came to be and mentioned to a young Zeke Yeager that he joined the Titan Biology Research Society primarily because of his curiosity. Usually seen with a smile on his face, Ksaver was an easy-going man with a slight care-free attitude; he was also compassionate and comforted Zeke after the boy turned in his parents to the Marleyan authorities.
Appearance: Ksaver had short dark hair and a round face. He wore the traditional apparel of a Warrior and a red armband, showing that he was an Eldian and an honorary Marleyan.
Personality: Possessing an inquisitive mind, Ksaver was always curious about how the Titans came to be and mentioned to a young Zeke Yeager that he joined the Titan Biology Research Society primarily because of his curiosity. Usually seen with a smile on his face, Ksaver was an easy-going man with a slight care-free attitude; he was also compassionate and comforted Zeke after the boy turned in his parents to the Marleyan authorities.
History: In his early adulthood, Tom Ksaver lived as a resident of the Liberio Internment Zone. In the year 817, he ran into Grisha Yeager and Faye Yeager as the children watched an airship pass overhead.
How Tom Ksaver echoes later: After Zeke Yeager loses his glasses in a battle against Levi Ackerman in the Titan Forest, he remembers his time with Ksaver and then reminds himself that he has a mission to do. Having recalled their history together, Zeke screams for Ksaver to watch him before detonating the Thunder Spear lodged in his stomach. Ksaver is one of the many Titan inheritors whose Titan is created by Ymir Fritz to defend Eren Yeager while he is attempting to Rumble the world.
Source: Attack on Titan Wiki, available under CC BY-SA 3.0.