Historia is petite and the smallest soldier from the 104th Cadet Corps from which the central cast originates. She has long blonde hair, large blue eyes, and a heart-shaped face; she usually wears the standard Scout Regiment uniform. Historia is noted for being very pretty; this, coupled with her kindness, sometimes causes her classmates to wonder if she is a goddess or an angel. It is hinted that many of the boys in her class adore her. While on expeditions, she wears her hair in a low ponytail and dons the traditional green Scout Regiment cloak.
Historia displays kindness to all those who cross her path, and takes any available opportunity to help people. She is shown to be rather meek, but friendly to those she is close to in the Scout Regiment. Historia is not above making sacrifices for others, as she willingly tears her clothing so that she may give Reiner Braun a sling for his broken arm, which she treated for him. Historia also goes out of her way to see that others are well, making sure that Sasha Braus has food and water after her punishment in the 104th Cadet Corps and sticking up for her when Ymir picks on her.
While Historia is kind and considerate of others, she is not fearless. Historia showed extreme fear when she made the decision to join the Scout Regiment and when facing Titans outside the Walls. However, Historia consistently charges into the face of danger, even if she is unarmed. Ymir accuses this tendency of Historia's to be attributed to her desire to die a hero, which she vaguely denies but later admits to.
Some years ago, the cadets of the 104th Cadet Corps complete a snowstorm training exercise, arriving at a base at the foot of a mountain. After some brief discussion among the cadets, Reiner announces that Christa is missing. Mikasa says that Christa had chosen to stick with Daz, who was performing poorly, but Reiner says that Daz as well as Ymir have not returned. Marco suggests that she may be with Thomas' squad, but Reiner points out that his squad just completed their course with Ymir, Daz, and Christa nowhere in sight. Worrying for their safety, Eren proposes organizing a search for them, and their training instructor says that a search will begin the next morning. Eren insists that it will be too late if they hold off on the search, but the instructor says that more cadet lives cannot be risked in the snowstorm.
Elsewhere in the storm, Christa and Ymir make their way through a forest with Daz unconscious in a cot pulled by Christa. Ymir says that they will only survive if they abandon Daz and head for base together, but Christa insists that they can all survive if Ymir goes ahead alone while Christa takes Daz. Ymir notices that Christa has not asked for help during their entire course, and she realizes that Christa has no intention of saving Daz nor herself. She says that it would be very against Christa's character to bring about Daz's death while searching for her own heroic end, but Christa insists that such is not the case.
Ymir brings up the fact that she is aware of Christa's true past, a daughter of a nobleman's mistress whose life was at risk. Recalling her days before training, Ymir reveals that while in the interior she overheard the Order of the Walls discussing Christa's existence. Since an illegitimate child could not properly succeed the head of the family, they had considered ending her life, but in the end it was decided that it would be enough to give her a new name and an inconspicuous life, eventually leading to her joining the Cadet Corps. Christa wonders if Ymir joined the Cadet Corps in order to find her, and Ymir proposes that it may be due to her own past being similar. Christa wonders if Ymir originally wanted to befriend her, but Ymir says that they are nothing alike. Unlike Christa, Ymir kept her old name after starting a new life, and abandoning her name would be to admit defeat. By living for herself, she robs her enemies of their power. Ymir scolds Christa for looking for death rather than directing her feelings towards her enemies, and Christa says that there is no longer any way for all three of them to survive their mission.
Ymir leads Christa to a cliff overlooking the base at the foot of the mountain and proposes tossing Daz over the edge so that she and Christa can make it to base alive while Daz can be searched for later. When Christa objects, Ymir takes matters into her own hands and throws her aside into a snowbank. Ymir wanders off while Christa is submerged, and there is a flash of light in the distance. When Christa escapes from the snow and returns to the cliff, Ymir and Daz are nowhere to be found. Back at base, Eren prepares to head outside in search for the others, and Mikasa and Armin decide to help. Reiner and Bertholdt also decide to join, bringing more equipment for the trip. Conny, Marco, and Sasha agree to come along as well. Suddenly, a loud crash like thunder is heard outside, and the cadets head outdoors to investigate. In the distance, Sasha spots Ymir dragging Daz through the snow. Some time later, Christa arrives and spots Ymir outside the base. She asks about Daz, and Ymir shows her that Daz is safe indoors. Upon looking at the cliff from the ground, Christa sees that such a descent would be impossible without rope. Ymir decides to reveal to Christa how she saved Daz, but only if she promises to live by her true name when her secret eventually becomes known to everyone.
StoryColossal Titan breaching Wall Maria, Historia lives in a refugee camp before reaching the minimum age requirement to enable her to enlist as a cadet.
In the year 848, two years before graduation, Historia accompanies the other cadets on a wilderness hunt to sustain themselves in times of peace. Along with the other cadets, Historia is pulled into an equipment heist by thieves in the forest and is kidnapped, held as a hostage so the cadets do not retaliate. The ones left behind create a plan to try and rescue her, and after some trouble and the eventual capture of the thieves, Historia is safely returned and the thieves arrested.Armin overcome the distress of him believing himself to have lost his friends to the Titans. She then plays a role in helping Mikasa lead expedition with the other cadets retaking control the supply room, enabling the cadets to affect a resupply which is preventing their withdrawal from Trost until then. This is while the Mysterious Titan engages other Titans in combat, distracting them from the expedition.
As ordered, in the aftermath of the battle of Trost District, she reports her omni-directional mobility gear to the Military Police Brigade for inspection as a part of the investigation over the deaths two captured Titans, presumed to be have been killed by a soldier using vertical maneuvering equipment. Despite her fears in facing the Titans in combat again she volunteers to become a member of the Scout Regiment, something she later says is a decision made by her innermost self and that she herself does not understand the reasons behind it.
During her first expedition out of the Walls she saves Reiner, Armin, and Jean after they become partially stranded in combat against the Female Titan by supplying them with a horse allowing all of them to proceed on horseback.
She is then seen to be holding her position on the tree line (as per orders) baiting the Titans and preventing them from entering the forest while the Scout Regiment attempts to capture the Female Titan.
Historia is later shown to be part of the group that is being suspected for being comrades of Annie, when the Beast Titan suddenly attacked with the other Titans.
When Minister Nick reveals to the members of the Survey Corps that Historia may know about the Walls having Titans inside them because of her family, and that she went under an assumed name after being caught in the middle of her relatives' dispute. It is not long until Eren and the others realize that she was often around Ymir.
After Historia and the rest of the recruits watch Ymir fighting against the group of Titans nearly falling off the tower when Ymir transformed, to which Reiner questioned her if she knew about it but tells she did not know herself despite being so close to her and refuses to believe it at first. When the recruits question whose side Ymir is on, Historia remembers some events of her and along with the other watching Ymir's attempt to fight the other Titans and came to the conclusion that she is fighting to protect everyone. She begins to cheer for Ymir telling her not to die and to break down the tower and celebrates when Ymir does so. She, along with the others, ride on her back and land on the ground safely, except for Ymir who is eaten by the Titans. As Historia tries to make her way to Ymir to fulfill her promise she is nearly grabbed by a Titan but is saved by Mikasa. As everyone watches in disbelief at Ymir's wounds and the truth, Historia reveals her true name.
Historia's abilities with her blades and ODM gear are above that of the average soldier, as she was able to get into the top 10 in the 104th Cadet Corps despite 218 other soldiers in her class. However, it is believed that Historia's placement in the top 10 was largely due to the influence of Ymir, who Historia knows did something to aid her so that she may have the chance to going the Military Police Brigade, though she is not sure what.
- Ymir - Their relationship is complex, but they are very close, and Ymir has been stated to be in love with her.
- Sasha Braus - Sasha initially regarded Historia as a goddess when she brought her food and water after she had spent several hours running. The two seem to have remained close during their training days.
- 104th Cadet Corps - Historia is admired by the rest of the cadets, and the most popular girl among them. Many of her male classmates have a crush on her due to her beauty and kindness, as demonstrated when she rescued Reiner Braun, Armin Arlelt, and Jean Kirschtein.
- Conny Springer - Although they have only been shown interacting a handful of times, Historia and Conny clearly appear to be good friends.
- The official site reveals that the majority of her male classmates had a crush on her, referring to her as the "Goddess" of the 104th.
- A recurring gag in the series is that people actually refers to her as "goddess" or by terms related to God in several circumstances. First it was Sasha in Episode 3 when Historia gave her a bread after Sasha fell tired for being forced to run for 5 hours; second time by Jean and Armin in Episode 18 when she came to their rescue after they were attacked by the Female Titan.
- Her name Historia is Greek in origin and means "History". Also, her pseudonym Krista is of Greek origin (greek: Χριστή), meaning "she who is the anointed one". In Hebrew, "the anointed one" is "messiah".
- Her alias surname "Lenz" means "spring" in old German.
- At the Animagic 2014 series panel, producer George Wada confirmed that Ymir and Historia are "indeed a couple".