|Two brothers are going to remake the world. I just want to have a good view of the action.|
|— Yelena to Commander Pixis|
Yelena (イェレナ Yerena?) is one of the Anti-Marleyan Volunteers working under Zeke Yeager. She is one of the Marleyan soldiers on board the first survey fleet to Paradis Island after Marley's failed attack operation.
Yelena is a very tall woman with her blonde hair in a bowl cut. She has large, black eyes and somewhat androgynous features. She wears the standard Marleyan military uniform.
Like the other Anti-Marleyan Volunteers, Yelena's casual clothing consist of a dark jacket over a dress shirt, and long pants.
She is a fervent follower of Zeke Yeager, holding great admiration and respect for him. She is usually calm and collected, her demeanor remaining unchanged even when Jean Kirstein yelled at her for failing to see her job through. Nonetheless, she is willing to take responsibility and apologizes should she fail in her task. Yelena appears to have a very relaxed demeanor, but appears to also have dry, humorous undertones to much of her actions.
Many have noted that Yelena is somewhat deranged in her zealotry; if any of her comrades are thought to have been working against their goals or insult those they are trying to ultimately save, Yelena would come forth and immediately kill them without hesitation. It can also be argued that she is a sociopath, basking in the destruction of numerous airships and countless people while smiling and on the verge of tears.
Yelena saw her homeland being invaded and conquered by Marley and after that, she was forcibly drafted as a soldier to fight in the Marleyan military. She met similar minded soldiers and she organized them into the Anti-Marleyan Volunteers to fight against Marley, but admits they had limited success.
During the early stages of the Marley-Mid East War, Yelena and her comrades were placed in a situation where they completely lost their will to rebel against Marley. However, Zeke Yeager saved them from death, rejuvenating their fighting spirit, and inspiring Yelena. She also becomes a devoted follower of Zeke, even considering him a God. She and her group joined with Zeke and begin planning a rebellion in earnest.
As she works with Zeke, she and the other members of the Volunteers are notified by Zeke of his half-brother Eren, who has possession of two Titan abilities. Expressing a desire to see him, Yelena volunteers to go to Paradis Island as part of the crew serving aboard a survey ship. In 851, the ship arrives at Paradis and is promptly captured and beached by Eren's Titan form; soon, she and her fellow soldiers 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. As they prepare to disembark, Yelena gazes up at Eren's Titan, noting that she has been wanting to meet him for some time.
Meeting with Hange and Levi Ackerman, 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 her that they are simply conscripted soldiers who have chosen to rally around Zeke Yeager 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 preparing to fight back against Marley.
Around one year later, the Anti-Marleyan Volunteers arrange a meeting between Paradis and the Azumabito family to discuss an alliance. While waiting for the family to arrive, Yelena gets a chance to see Eren. She is ecstatic to finally meet him, and despite not being allowed to interact with him, declares that it will be a good day. As the Azumabito family arrives, Yelena calls Mikasa Ackerman's attention to their appearances, explaining that they resemble Mikasa's mother because they are related to her.
While attending a banquet to celebrate the opening of the rail system in Trost District, Yelena's personal guard is abruptly changed, being replaced by Floch Forster. This allows her to slip away unnoticed and meet with Eren in private. Both having grown impatient with the military's perceived lack of urgency, they easily come to an agreement that something needs to be done to stir up the military and push it to action; she mentions to Eren the basic premise of Zeke's plan and states that he wishes to speak with Eren about it in greater detail. At about the same time, Yelena began distancing herself from the other Volunteers and arranged with Zeke to have numerous bottles of wine mixed with his spinal fluid sent aboard the survey ships to Paradis. She meets with Niccolo and tells him the wine being brought in are to be distributed and given to all those the military, especially the more senior members and leaders.
In 854, after their forces receive word that Eren Yeager is planning on launching a full-scale attack on Marley, Yelena is among the forces Paradis Island dispatches to retrieve him. Using a fake beard to disguise her appearance, she pretends to be a Marleyan soldier from the Lakua military base in the west and arrives at the Warriors' seating area during Willy Tybur's production. Declaring 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 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, she joins the rest of the Survey Corps on the airship. Standing in a room along with Zeke, Eren Yeager, Armin Arlert, Levi, and Mikasa Ackerman, she takes her fake goatee off when Levi asks her to, commenting how people seemed to like it. They are soon joined by Jean Kirstein, who brought the recently captured Gabi Braun and Falco Grice. 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 Pixis has his soldiers capture the Volunteers, revealing that Paradis is not yet willing to trust Zeke and his followers. Yelena is unconcerned with the betrayal, confidently declaring that the Volunteers and the Eldians will soon dine at the same table.
After some time in confinement, Yelena receives a visit from Pixis. She notes that the view is nice, but sarcastically notes that it would be nicer without the bars on her windows. Pixis acknowledges that Eldia is in their debt for all the Volunteers have done for them, before noting the seemingly great lengths Yelena has gone to appear trustworthy. Pixis produces a report and reveals that Eren started acting without authorization roughly ten months prior, around the same time that Yelena attended an event in Trost District near his residence. He also makes note of the fact that the guard for her that day had been Floch Forster, who was part of the group arrested for leaking Eren's confinement to the press. Yelena seems surprised at this as Pixis goes to the table in her room and sits down.
Yelena quickly admits to meeting with Eren, apologizing for keeping the meeting a secret. She claims that she only met with Eren to persuade him to do something that forces the military into action, but Pixis points out that she could have just talked to the military directly. He accuses her of trying to influence Eren to Zeke's will, but Yelena passionately argues that she did not, and that she only wanted to meet Eren out of curiosity due to his unique traits as the Founding Titan and as Zeke's brother. Revealing that none of the other Volunteers are aware of her meeting Eren, Yelena claims that she only wants what is best for Eldia. Pixis remains unconvinced, telling her that she is a terrible liar.
After the military's officials learn that they have unwittingly been drinking Zeke's spinal fluid, many of them defect to the Yeagerists so that they will not be turned into Titans. As a result, Pixis is forced to surrender unconditionally to the Yeagerists, and is brought to speak with Yelena. Yelena begins the meeting by reminding Pixis of her promise that the military and the Anti-Marleyan Volunteers would soon dine with each other again. She remarks how glad she is that Pixis ordered no resistance to their demands and agreed to meet with her, but Pixis points out that he is only complying because his hand has been forced. He goes on to remark that the Yeagerists' strategy of marking Eldians who were quicker to join their side is strikingly similar to Marley's systems of oppression, but Yelena is unfazed by the comparison; she stares at Pixis and reminds him that they refused to join the Volunteers, lamenting that the world would already be saved were it not for the military's overly-cautious nature. Pixis is confused by her statement, pointing out that releasing the Colossus Titans would only save Paradis, but Yelena refuses to clarify her statement. Instead, she glares at Pixis and condemns him for trying to have Zeke killed, promising that he will punish the Eldians of Paradis for their actions.
She then travels to the cell holding the captured Survey Corps soldiers and again regrets they are meeting again behind bars. Yelena takes offense when Grior begins insulting the memory of Sasha Blouse and promptly shoots him when he calls her a filthy whore and an island devil. She apologizes for his rudeness and, pulling up a chair, decides to reveal the specifics behind the euthanasia plan. She begins to glorify how Eren and Zeke will be spoken of as symbols for thousands of years, and is glad to hear Armin state that he was moved by her words. Just then, Yelena is shocked to hear from a Yeagerist that someone managed to infiltrate their ranks. Going to meet Eren on top of the building, she is surprised to see Pieck and Gabi with him; as they are led to the edge of the roof, Yelena shares with Eren how he should not trust Pieck. As Yelena signals to the Yeagerists to get ready to fire if needed, the rooftop cracks and Galliard's Jaw Titan appears in front of them. Yelena is at a loss for words as she then notices several blimps from Marley arrive at their location. Yelena pleads with Eren to exit his Titan form and flee to safety underground. Eren ignores her and goes to pursue the Warriors, and Yelena orders that the Yeagerists' forces be mobilized to protect him.
As they watch the ensuing battle from the headquarters, Yelena and her compatriots are stunned to see the tide of the battle rapidly turning in Marley's favor. Yelena is horrified to see the Warrior Titans slowly triumphing over Eren and is overjoyed when Zeke arrives to aid Paradis's forces. Yelena is thrilled by the sight of Zeke destroying the Marleyan airships, and continues to watch the battle as the newly freed members of the Survey Corps arrive on the roof to join the battle. As Jean ponders why Zeke is here in Shiganshina, Yelena forms a smile and states that he must have defeated both Hange and Levi to reach them. After hearing Armin dismiss Connie's concerns and that they have to team up with the Yeagerists to help the plan succeed, Yelena gazes intensely at him only to smile and ask they help Eren and Zeke survive.
- Zeke Yeager - Yelena holds Zeke in high regard and sees him as a God after saving her life during the Marley Mid-East War. She follows his commands without question.
- Onyankopon - One of the other high ranked members of the Volunteers, Yelena has a stable relationship with Onyankopon. Occasionally, though, Onyankopon is surprised and disturbed by Yelena's methods and her devotion to Zeke.
- Eren Yeager - After hearing from Zeke about the existence of his half brother Eren, Yelena has harbored a desire to see him due to holding more than one Titan ability, including that of the Founding Titan. She now holds Eren in as high regards as Zeke, calling him a god and a future symbol that people will look to for thousands of years.
- Dot Pixis - Yelena has displayed some level of respect towards Commander Pixis despite him ordering the Volunteers arrested. The feeling is mutual, though Pixis has recently begun to harbor some slight distrust towards her. Their relationship becomes hostile after Yelena discovers the plan put forth by Pixis and the military to have Zeke killed immediately after he sets foot on Paradis and now treats him with disdain, mocking Pixis' decision to not align with the Volunteers.
- Yelena is the Anglicized form of "Jelena" which is, in turn, a Slavic derivation of a Greek name "Helénē" (Ἑλένη).