Linie

Linie (リーニエ) is a Demon working under Aura. Under Aura's instruction, she was sent to assist Lügner alongside Draht to perform negotiations with Graf Granat.

Personality
Like all demons, Linie has no concept of human emotions. She is also shown to be loyal to both Lord Lügner and Aura the Guillotine, rarely speaking or acting out of turn except in response to threats unlike her counterpart, Draht. Like most demons, she is confident in her abilities and could not perceive the threats that enemies could pose to her, eventually leading to her demise.

Appearance
Linie is a Demon of small stature and with the appearance of a young girl. She has purple eyes and pink hair, styled into bangs and tied with black ribbons into two voluminous twintails that reach her chin. A pair of small horns protrude behind each of her twintails.

Linie's outfit is reminiscent of gothic Lolita fashion. She wears a white collared blouse with puffy sleeves underneath a dark brown dress with white frills and a large skirt that opens in the front, showing white ruffles underneath. A brown corset is tied over her dress, and she dons Mary Jane shoes. Her accessories include a brown ribbon tied around the collar of her blouse and red stockings with brown stripes.

As a younger Demon about eighty years prior, Linie had the appearance of a child. She let her hair straight down and wore a much simpler long-sleeved dress with black shoes.

History
Linie was born sometime before the Hero Party's defeat of the Demon King. During one of the party's fights, she witnessed Eisen in battle and observed his mana and actions, leading to her ability to mimic his fighting style.

At some point, Linie started working under Aura, one of the Seven Sages of Destruction. Becoming the Sage of Destruction's personal executioners alongside Draht and Lügner.

Demon Infiltration
During the Demon Infiltration Arc, Linie and Draht, operating as "Messengers of Peace" under Lord Lügner, are sent to Graf Granat's heavily fortified city, protected due to its ongoing conflict with the Sage of Destruction, Aura the Guillotine. Their mission is to negotiate or coerce Graf Granat into lowering the magical barrier that keeps demons out of the town. It is revealed that Graf Granat has no intentions of holding negotiations with the demons when the Graf and his sentinels raise their swords against Lügner. In response, Linie readies herself for a fight, but Lügner intervenes, defusing the situation by falsely claiming his nonexistent father's death in response to Granat grieving his own son.

The messengers' diplomatic efforts come to an abrupt end when Linie can no longer detect Draht's mana, supposing that the demon has been killed by the previously imprisoned Frieren, whom Draht wants to murder. Draht's murder of a sentinel guarding Frieren's cell and the elf's missing whereabouts immediately lead Granat into suspecting the messengers. Realizing their plan has failed, Lügner moves to violently force Granat into lowering the barrier. The two demons then leave Granat in a room, threatening him with further torture if the Graf remains quiet. When they return, they find Stark attempting to free the Graf. An ambush ensues with Fern successfully damaging Lügner as they quickly withdraw. Lügner prevents Linie from engaging Fern as he recognizes that Fern could easily kill her, instead tasking her with battling the Warrior Stark later.

With Lügner's blood aiding in locating the young warrior and mage, the two demons ambush the humans. Linie engages Stark while conjuring an axe. Linie reveals that she recognized Stark's movements and had coincidentally recorded Eisen's techniques when she was young, leading to her using the Imitation Spell: Erfassen to imitate Eisen. Stark's fear and lack of experience initially allow Linie to dominate the fight, with Stark persevering despite each attack. Stark's determination eventually leads to his victory, as it becomes apparent that while Linie can flawlessly copy Eisen's moves, she lacks the same power behind her attacks. Stark counters with a Lightning Strike that swiftly ends the battle, defeating the demon.

Abilities
Linie specializes in reading mana, allowing her to record the mana flow of a person as they move.
 * Imitation Spell: Erfassen: Linie possesses the unique ability to craft an array of weapons using her mana, mimicking the movements and skills of individuals whose mana she has studied. However, a significant limitation of this technique is its inability to replicate the same level of strength as the target, leaving her ultimately weaker than the original. She is also unable to create more than one weapon at a time, requiring a brief moment for her to morph her weapon to use a different combat style.Linie Axemanship.gif
 * Imitation Axemanship: Linie is able to create an axe with mana and replicate the movements of Eisen after witnessing the warrior's battle in the past. She can replicate Eisen's signature downward slash as well as its variations, such as downward swings transitioned from a spinning attack or front flip. However, she does not have the strength to use Lightning Strike — the downward slash's true form. She is capable of using Eisen's other attacks, including an upward side slash from a crouching position.Linie Swordsmanship.gif
 * Imitation Swordsmanship: Imitating the movements of a soldier from Graf Granat's Domain, she swings her sword using her body's momentum and spins to deliver heavy sword attacks that knocks her opponent off balance.Linie Spearmanship.gif
 * Imitation Spearmanship: Linie moves to create distance with her opponent and then throws the spear toward them from afar. She has enough strength to throw it with one arm and shows high precision with her attacks. Linie also uses the spear as an anchor to land safely, using it reduce the momentum from falling by grabbing and spinning on it.Linie Knifemanship.gif
 * Imitation Knifemanship: Linie displays immense precision and skill with the knife, with each throw targeting her opponent's vitals. She uses this skill to momentarily stop her opponent's retreat, creating an opportunity for her to close the distance with them.
 * Mana Detection: It is mentioned by Lügner that Linie is also skilled at detecting mana. She was able to detect Draht's mana up until the demon's death at the hands of Frieren.

Trivia

 * Linie enjoys eating apples.
 * Linie is German for "line" or "trace". It may be in reference to her ability to copy other's mana.