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|I'm the strongest one here in this terrain. I'd be able to dominate this area, don't you think?|
|— Ymir boasts her Titan's agility|
The Dancing Titan is one of the Nine Titans. Its ability is unknown, however it may be related to the great amounts of agility possessed by its holder when in Titan form. It is currently in the possession of Ymir, though her whereabouts and the fate of her Titan are currently unknown.
While the exact abilities of the Titan held by Ymir and Marcel are unknown, Ymir has demonstrated significant amounts of speed and agility in her Titan form. Though Ymir's Titan is relatively small and weak, her mobility excels in terrain such as Titan Forests.
This Titan, like all the Nine Titans, was brought into the world after the death of Ymir Fritz. In the 1,700 years following her death, the Titan was held in the possession of one of the eight warring Eldian houses subservient to the Founding Titan. After these seventeen centuries when the 145th King of the Fritz family abandoned the conflicts of Eldia and relocated to Paradis, this Titan was taken by the nation of Marley during the Great Titan War.
At some point before the year 845, Marcel was chosen to inherit the power of this Titan. Some time later, the nation of Marley sent out Marcel, Reiner Braun, Bertolt Hoover, and Annie Leonhart across the ocean to the island of Paradis as the start of the plan to regain the Founder. However, at some point before or after the attack on Shiganshina District, a Titan approached Reiner and nearly had him in its grasp until Marcel moved him away to safety. Marcel was caught in Reiner's place, and he was eaten alive as his comrades escaped. The Titan inherited Marcel's power and regained its human form: an Eldian girl named Ymir, who had been wandering as a Titan for around sixty years.
Choosing to start a new life for herself, Ymir made her way into humanity's territory and began living as a thief in the interior territories of the Walls. At this time, she overheard the story of Historia Reiss from members of the Church of the Walls and her plans to join the 104th Training Corps. Desiring to meet her for political and personal reasons, Ymir joined the Training Corps in the same year as Historia, who trains under the alias "Krista Lenz".
At some point during their training, Ymir and Krista face difficulties escorting a sick trainee to shelter in harsh winter conditions. Wanting to see Krista survive, she sends her off to the shelter alone and uses the power of her Titan to bring their fellow trainee to safety at the base of a cliffside. Krista wondered at how Ymir could have possibly reached the shelter before her. Ymir agreed to tell her secret to Krista under the condition that when the secret of her Titan powers are publicly known, Krista would go back to living under her true name.
During the Wall Rose invasion in the year 850, Ymir is among the recruits of the Survey Corps when they are cornered by Titans at Utgard Castle. Seeing no hope for escape, Ymir chooses to make use of her Titan form to confront the Titans. Transforming before her friends' eyes, she battles the Titans at the base of the castle as the others comprehend the revelation of her powers. Reiner and Bertolt recognize her Titan as the one that ate Marcel five years ago and determine that they must capture her along with Eren when the time comes. When Ymir begins to struggle, Krista offers her encouragement. Ymir's Titan ascends the castle and saves the others from its collapse. When the dust settles, Ymir's fatigued Titan is unable to continue fighting against the Titans, but her life is saved with the arrival of the Survey Corps soldiers from the Stohess District raid. She is safely extracted from her Titan, and Krista reveals her true name as Historia Reiss.
Shortly afterwards, when Bertolt and Reiner reveal their identities as the Colossus and Armored Titans, Ymir is taken by the two warriors along with Eren. After some questioning, Ymir agrees to cooperate with them in order to capture Historia. When the Survey Corps finds their location, she takes Historia into her Titan's mouth and escapes with Bertolt and the Armored Titan. Ymir remains within her Titan form throughout the escape, taking a moment early on to partially expose her human form in the nape in order to speak with Historia. Ymir abandons the Armored Titan when it is swarmed by a horde of Titans lured by Commander Erwin Smith and assists the Survey Corps for a short time, but upon seeing Eren's use of the Founding Titan during the battle Ymir chooses to go with Reiner and Bertolt rather than staying with the Eldians of the Walls. After the battle, Ymir escapes with Bertolt and the Armored Titan to the ruins if Shiganshina District.
Two months afterwards, Ymir's Titan is not present at the battle of Shiganshina District. Four years later, her Titan is not counted among those lost by Marley during the plan to regain the Founder, so it is very likely that Ymir's Titan is currently in Marley's possession once again.