Tom Ksaver

"I tried to find...my lost child in you. I tried to run away from my sins using the power of the Titans. How much better it would all have been...if I was never born into this world?"

- Xaver expresses his regret

Tom Xaver (トム・クサヴァー) was an Eldian researcher and Warrior who held the power of the Beast Titan. He was the mentor and friend of Zeke Yeager.

Appearance
Tom 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. Tom also wore glasses that Zeke Yeager would later wear as an adult.

Personality
Possessing an inquisitive mind, Tom 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 it. Usually seen with a smile on his face, Tom 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.

Underneath Tom's friendly nature, he also harbored feelings of self-loathing, along with a desire to kill himself as a means to atone for the part he unknowingly played in the deaths of his family. He also seemed to care little about the ideals of the Warrior Unit by calling it stupid to shorten one's lifespan just to invade other countries.

History
At some point in his adulthood, Xaver fell in love with a Marleyan woman. Knowing that it is forbidden for Eldians and Marleyans to marry, he purposefully hid his Eldian armband whenever he saw her and the two soon got married. Several years after Xaver's wife gave birth to their son, she managed to discover his Eldian heritage and promptly killed both herself and their son in shame; Xaver discovered them shortly afterwards and was overcome with grief. Xaver would later become a Warrior as a form of suicide and eventually inherited one of the Nine Titans, the Beast Titan. He also became a researcher in order to study the Titan powers.

Roughly halfway through his term, Xaver began observing the new batch of Warrior candidates who would potentially inherit his Titan. He took particular interest in one who was lagging behind, and Instructor Magath informed him that the boy's name was Zeke Yeager. Although Magath did not respect the boy because of his poor performance, Xaver did not share his low opinion.

Xaver would eventually meet Zeke in person while playing catch by himself. After a bit of encouragement, he managed to convince Zeke to play with him, complimenting the boy for his pitching ability. Xaver would continue to bond with Zeke through their games, even explaining how he believed conflict was ridiculous compared to the mystery of the Titans.

One day, Xaver found Zeke crying in the alley where they usually played catch, and was horrified to learn that the boy's parents were leaders of the Eldia Restorationists movement. With the Marleyan authorities close to discovering the identities of the cell's leaders, Xaver suggested that Zeke turn in his parents before they were found out in order to prove his loyalty to Marley. Although Zeke was reluctant, Xaver convinced him by reminding him of all of the emotional turmoil the boy had faced as a result of the pressure his parents put on him. When Zeke exposed his parents as members of the Eldia Restorationists, Xaver was with him and his grandparents as Grisha and Dina were detained by the Public Security Authorities.

Xaver continued to play catch with Zeke as the boy progressed through the Warrior program. As he approached the end of his term, Xaver revealed to Zeke that he had discovered through his research that the Founding Titan, in addition to memory alteration, was capable of changing the very body composition of Eldians as well. Zeke suggested that if that were true, the Founder could be used to sterilize all Eldians and eradicate the Eldian race in about a hundred years; after a brief pause, Xaver then told Zeke about his own son's death. He goes on to say that he tried running away from his sins by using the power of the Titans and tearfully wondered how much better it would have been if he was never born into this world. Zeke promised Xaver that he would inherit his Beast Titan and use it to take the Founder away from both Eldia and Marley, so he can free the people of the world from the fear of the Titans.

Close to the end of his tenure as the Beast Titan, Xaver takes Zeke aside and reveals something he did not pass on to the Marleyan authorities; that he discovered a way to break the war renouncement vow made by Karl Fritz. He says that in order for it to be broken, a member of the Royal family must work in tandem with the holder of the Founding Titan in order to make the euthanization plan succeed. Xaver requests that Zeke find a holder of the Founding Titan that will understand their motives and agree to the plan.

In 842, Xaver is chained up in an alter and fed to the mindless Titan form of Zeke. Just prior to being consumed, Xaver silently tells Zeke that he will always watch over him.

Unnamed final arc
After Zeke loses his glasses in a battle against Levi in the Titan Forest, he remembers his time with Xaver and then reminds himself that he has a mission to do. Having recalled their history together, Zeke screams for Xaver to watch him before detonating the Thunder Spear inside his stomach.

Relationships

 * Zeke Yeager - Initially watching him from afar, Xaver formally met Zeke one day after the latter's training session. Over time, he would bond with Zeke and give him guidance and advice when needed. Xaver cared for Zeke so much that his final thought before dying was to acknowledge Zeke as a surrogate son and that he would always be watching over him.

People killed

 * Previous inheritor of the Beast Titan (as a Pure Titan)

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