Yeagerists

"Their one and only purpose for now must be to put Zeke and Eren in contact with one another. Then, they'll purge the Corps with Eren at their center."

- Hange theorizes on the Yeagerists' plan

The Yeagerists (イェーガー派) is a rebel faction supported by civilians and former soldiers from the Paradis military. Their goal is to reunite Eren Yeager with his half-brother Zeke, and to create the "New Eldian Empire" (新生エルディア帝国).

Duty
The Yeagerists believe Eldia is on the verge of destruction and only they can save the island by dedicating themselves to Eren Yeager. The rebellious faction claims those who subordinate themselves to the outdated ideals of the current Royal Government will only watch as they are devastated by the outside world.

Structure
The group is known to consist of over a hundred members, many of them from the Survey Corps. However, the true extent of their influence is unknown with many soldiers and civilians vowing to devote their hearts to Eren Yeager. It is said the Yeagerists effectively control everything inside the Walls.

Marley arc
It is believed that the initial formation of the Yeagerists was around the time when Zeke Yeager presented to Paradis Island the plan to rescue the Eldian people whose existence is threatened. This plan involves awakening the Titans sleeping within the Walls in a process known as "The Rumbling." Later on, Eren would begin to act on his own while defying the military that intended to betray Zeke Yeager by feeding him to Historia upon his arrival to Paradis. At some point, many people began to see Eren as their savior who could save the Eldian Empire.

The group steadily increases in size and waits for the right moment to strike. After Eren infiltrated Marley and the resulting Battle of Liberio, Eren is arrested for his actions and causing the deaths of several Survey Corps soldiers. Word spreads about his imprisonment and the four who leaked the story are arrested as well, while protesters demand that Eren be released.

Meanwhile, Yeagerists within Survey Corps would go on to procure wine for the soldiers detaining Zeke within the Titan Forest. This wine was taken off the captured Marleyan ships and is tainted with Zeke's spinal fluid.

Eventually, several members plant a bomb in a chair belonging Commander Darius Zackly and place it in his office. They later trigger the bomb, killing Zackly and several members of the Military Police. At roughly the same time, Eren uses his newly granted powers of the War Hammer Titan to tunnel his way out of his cell and seals his escape route so he could not be followed. While this happens, the other members free Eren's allies and escape the prison as well. Regrouping out in the mountains, Eren meets with his followers and declares he will locate Zeke.

After Eren's escape, the top military officials meet with Dot Pixis who believes the Yeagerists will target anyone who knows where Zeke is being held and then capture Queen Historia, who could act as a replacement for Zeke. Pixis then declares they will negotiate with Eren using Zeke's location and grudgingly decides to disregard their assassination of Darius Zackly in order to avoid more deaths, stating it is a cheap price to pay. However, this is just a ruse to commandeer the Founding Titan from Eren. The Yeagerists would somehow receive the proposal but it is rejected by Eren who refuses to entrust Commander Pixis with the fate of the island.

The Yeagerists later storm into a restaurant to attain the location of Zeke Yeager from Hange after receiving word from a Marleyan. The Yeagerists then capture those present at the restaurant including several officers of the Survey Corps and the Blouse family before departing to the Shiganshina District.

While in Shiganshina District, the Yeagerists interrupt a 109th Training Corps exercise in an attempt to seize control of the division. Floch is able to quickly drum up support from the sympathetic trainees, and rebuffs Keith Shadis, who he has the trainees beat, for representing the old, outdated system. After praising the Yeagerist affiliated division, Floch once again demands that Hange take them to Zeke's location.

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