|Along with the War Hammer Titan, we have received and passed down memories. That is the role of the Tybur family.|
|— Willy Tybur on his family remembering Eldia's past|
The Tybur family (タイバー家 Taibā-ke?) is a house of Eldian nobles living in Marley as honorary Marleyans, although they are actually the nation's highest authority. Even though they are Eldian, they are highly respected throughout the world for being the first Eldian family to fight against their own rule during the Great Titan War; they gave Marley freedom and power as an act of atonement for their ancestors' crimes against the Marleyans. Willy Tybur was the head of the family.
Before the Great Titan War, the Tybur family was presumably one of the several Eldian houses warring for control over the Nine Titans. By the time war had broken out between Eldia and the remnants of Marley, the Tybur family had possession of the War Hammer Titan. Opposed to King Karl Fritz, the Tybur family was the first of the Eldian houses to side with Marley in the war. However, in truth, they collaborated with King Fritz to end the Eldian Empire due to the king's guilt over the atrocities caused by the Eldians toward the rest of humanity. With their aid, Marley gained the upper hand in the Great Titan War, acquiring the support of their Titan as well as that of the Colossus, Armor, Female, Beast, Jaws, and Cart Titans. During this time, the Tybur family and King Fritz created a fictional hero, Helos to give Marley something to be proud of after their victory over the Eldian.
In the aftermath of Marley's victory in the war, the Tybur family was praised for their support in the early fighting, and for their service, they were granted positions of high nobility as honorary Marleyans, permitted to live on luxurious estates whereas the remaining Eldian population was segregated into internment zones. The Tybur family would keep their high status in society for the next century, swearing loyalty to Marley. However, despite their pledge, the Tybur family would not use their War Hammer Titan in conflicts with enemy nations during this century.
It is later revealed that the family has done more than simply enjoy themselves for the last century and have been interacting with the upper-class men and women from around the world to improve the social standing of the Subjects of Ymir. This is presumably the reason why Eldians living in Marley face less hostilities than those living in internment camps of other countries. However, Willy does admit the previous Tyburs were less vigilant about these duties in comparison to the current generation.
In the aftermath of the Marley Mid-East War, Zeke Yeager grows concerned that the Eldian race has been put at risk with the world's growing technological advantage over the Titans. In order to gain the support of the viewing world for the next mission against Paradis Island, the Tybur family agrees to cooperate with the Warriors and take action using the power of the War Hammer Titan. Furthermore, the Tybur family makes preparations to hold a press conference in Liberio during an upcoming festival, where they plan to announce that Paradis Island will be overtaken within one year.
Willy holds his conference in the Liberio internment zone as planned. Despite secretly expecting a surprise attack from the forces of Paradis Island, Willy and Commander Magath proceed with their plans to bait an attack from their enemy. At his speech, Willy declares war on Paradis Island and is subsequently slain by Eren Yeager's Attack Titan, who begins a rampage.
The younger sister of Willy thanks her brother for his service to their family, then transforms into the War Hammer Titan to battle the Attack Titan. After a prolonged conflict, and despite her initial advantage, Eren Yeager defeats and devours the younger sister of Willy, thus signalling the loss of the War Hammer Titan from the Tybur family.
The Tybur family employs an army of personal guards. In term of appearance, they wear elegant dress uniform consisting of a dark-shaded tunic and black cross-belts, completing with black cavalry boots and a white spiked helmet engraved with the family's emblem. Each guardsman is armed with a rifle and a saber.
Guardsmen tasked to protect the family up close seem to be selected for their outstanding physique. When Magath and Koslow went to meet with Willy, they were brought in by a massive guardsman who is taller than the door frame.
- Unlike the other Eldians outside the Walls, the Tybur family lives in mansions, outside of the internment zones. They also do not wear armbands; even the Warrior Unit and their families, who are also considered "honorary Marleyans," do not have this privilege.
- The name "Tybur" appears to be a variant spelling of the name "Tiber," which is itself a variant of the Latin name "Tiberius." "Tiber" is also the English name of the river which runs through Rome and the third largest in Italy.
- The family's personal guards wear uniforms that resemble Prussian/German dress uniforms in the early 20th century. The spiked helmet is an obvious reference to the Pickelhaube.
- There are inconsistencies on the height of the massive bodyguard in Chapter 97. In two panels he was shown to be taller than a door, but in another panel, he was shorter.