Anti-Marleyan Volunteers (Anime)

The Anti-Marleyan Volunteers (反マーレ義勇兵) are a group of soldiers who previously served in the Marleyan army but decided to join Zeke Jaeger in order to free the Eldians.

Qualities
The members of the Anti-Marleyan Volunteers seem to possess a severe grudge against Marley, in part because of the empire's aggressive policy of expansion and the take over of their native lands. Before their introduction to Zeke Jaeger, the volunteers generally had low morale due to the adversity in opposing such a powerful nation. However, after meeting Zeke the soldiers became more hopeful. The Anti-Marleyan Volunteers hold a strong devotion towards their leader, with Yelena even comparing him to a God.

History
The Anti-Marleyan Volunteers started off as a loose collection of rebels organized by Yelena. The members largely composed of people from different nationalities that had seen their homeland being conquered by Marley. After being forced afterwards to join the Marleyan forces and to fight for the country that oppressed them, they grouped together to try to take down Marley and secure their freedom.

As stated by Yelena, they initially had very little success and lost morale over time. After meeting Zeke Jaeger, their spirits were renewed, and the two sides joined forces. Furthermore, the volunteers originally found it difficult to mesh together with all the uncertainty amidst. However, Yelena's ruthless murders of doubtful Marleyan comrades reduced this by lowering conflict, with members seeing this as a necessary evil.

Marley arc
In 851, a Marleyan ship arrives at Paradis and is promptly captured and beached by Eren's Titan form. They are confronted by Hange Zoë, offering to negotiate with them. When her commanding officer refuses to listen, Yelena promptly kills him and, along with Onyankopon, accepts Hange's offer to talk.

Meeting with Hange and Levi Ackermann, Yelena and Onyankopon allow the two to inspect their weapons, explaining that Marley has not yet launched a full assault on Paradis Island due to a war they are currently caught in. Hange guesses that Yelena and her comrades are sleeper agents who have infiltrated the Marleyan army, but Yelena explains to them that they are simply conscripted soldiers who have chosen to rally around Zeke Jaeger in opposition of Marley as the Anti-Marleyan Volunteers. Forming an alliance with Paradis Island, Yelena and her comrades begin sharing their technology with the islanders, and prepare to fight back against Marley.

Yelena disguises herself as a Marleyan soldier from the Lakua military base in the west and arrives at the Warriors' seating area during Willy Tybur's production. Claiming that Magath called for them, she asks that Pieck, Galliard, and Zeke follow her. Soon after, she sends Zeke off in another direction while continuing to lead the other Warriors. They stop temporarily when Pieck suddenly hugs one of the Panzer Unit soldiers that they meet on the way. She leads them into a room, where she traps the two in a hole.

At the end of the Raid on Liberio, Yelena joins the Scouts on their airship piloted by Onyankopon. Standing in a room along with Zeke, Eren Jaeger, Armin Arlelt, Levi, and Mikasa Ackermann, she takes her fake goatee off when Levi asks her to, joking that people seemed to like it. They are soon joined by Jean Kirschtein, who brings two captives with him. Jean yells at her for not carrying out her duty of locking up the Jaw and Cart Titan, causing more soldiers than necessary to die, for which she accepts responsibility.

After returning to Paradis, Yelena and her fellow Volunteers turn over a stock of Titan serums they managed to steal from Marley to the Garrison. After receiving the serums, Dot Pyxis has his soldiers capture the Volunteers, revealing that Paradis is not willing to trust Zeke and his followers yet. Yelena is unconcerned with the betrayal, confidently declaring that the Volunteers and the Eldians will soon dine at the same table.

War for Paradis arc
Dot Pyxis meets with Yelena. He brings up an event ten months ago when there was a celebration for the opening of the Trost railway. At that time, the guard watching her changed to Floch, and he escorted her to her lodgings. Now Floch has been detained for leaking information. At the same time, Eren began doing movements of his own.

After Dot Pyxis surrenders to the Jaegerists, the Volunteers are released from house arrest. They then join Yelena and Pyxis in the Shiganshina District where Yelena ostracizes the commander for provoking Zeke Jaeger.