Mjölnir

Mjölnir (ミョルニル) is a magician who was at first mistaken for a spiritual item but in actuality has optimized their physical body into various the forms of the hammer.

Etymology
The name is the name for the legendary hammer of, the god of thunder. Its kanji reading (雷神ハンマー), refers to her relationship with Thor.

Appearance
Despite being called "The Hammer," Mjölnir has various shapes but her first and most prominent appearance is that of a cylinder made of heavy stone with a diameter of 55 cm and a height of about a meter. The other forms were a sphere, a cube and finally a flat plane in the shape of a cross into a hammer. Mjölnir appears to communicate and recite spells by having countless sets of human lips both large and small appeared on its surface.

Personality
She shows loyalty to Marian Slingeneyer. She is shown being worried about her listlessness, agrees with her opinions, and is willing to attack Thor after kicking her down.

Despite being changed into a drum, Mjölnir can still choose to form a mouth to speak with people, though she seems to prefer to express herself by shaking and quaking around.

Background
The magician apparently gathered up a lot of power for an unknown reason only to have lost it in the transition for power during WWIII. With the reason to obtain strength gone, Mjölnir continued to gain power and go on a destructive path. Marian Slingeneyer, another member of GREMLIN, is responsible for her current form as a cylinder.

Homecoming Arc
Mjölnir appears onboard the Radiosonde Castle as its guard and controller for dropping onto Academy City. Due to Mjölnir's inability to cope with failure, one-third of the Castle was destroyed when the technique of "throwing hammer" was unleashed. She was later thrown off the structure when Kanzaki Kaori used an anti-flight spell on her.

Hawaii Invasion Arc
Her next appearance is in the aftermath of GREMLIN's invasion of Hawaii, where she is summoned shortly after Marian Slingeneyer uses her new cellphone, from there on she is seen accompanying Marian Slingeneyer while she converses with Othinus. Here, she is used against Cendrillon, who despite her speed, is quickly defeated by Mjölnir's long range attacks.

Eve of the Festival
In the eve of the festival, Mjölnir appears alongside Marian and Thor in Academy City, in order to collect Fräulein Kreutune for Othinus. Here, while Marian is completely listless after the death of Bersi back in Baggage City, Mjölnir clatters and shakes, expressing her worry towards Marian's attitude, and her dismissal of Thor's instruction on not making pre-emptive attacks. After Fräulein escapes the Windowless Building due to Touma and Thor's efforts, Marian still remains in the bench she was resting on, but notices that the Anti-Skill are on high alert. Marian ponders for a moment and asks Mjölnir what they should do, before ultimately disregarding it as too much of a hassle for her.

Marian finally takes action after receiving a lot of information regarding the disturbance in Academy City being related to Fräulein. She asks Thor to handle as she is unsure if she nor Mjölnir can handle her, much to the latter's chagrin. Thor tells Marian to meet up with him in a plaza in front of the District 7 station in order to have more firepower in capturing Fräulein. As Marian tries to search for Thor, she discovers a poster of a bulletin board declaring her to be a dangerous person involved in Baggage City, and that she should be reported to Anti-Skill. In truth, this was a gambit that Touma formulized, by making GREMLIN think that Academy City and Ollerus are attacking them, and Ollerus think that Academy City and GREMLIN are attacking his group. And to finish charade, Thor transforms into Marian for Touma use his picture to post in a public bulletin board, which Thor will direct Marian to. Marian tells Thor that they will have to move to a different hideout in order to take the time to analyze the situation, and she is forced to search for an abandoned building as her posters are up everywhere in the hotels, with Mjölnir following close behind Mjölnir follows Marian's way

Mjölnir is apparently unaware that Touma was following Marian in order to draw out the scout, and activate the second phase of his trap.

During the Festival


Mjölnir is present when Thor and Marian notice the shockwaves of the battle between the reformed Kakine Teitoku and Accelerator. Marian becomes genuinely curious of the events happening, wanting to investigate the goings-on in the city. Marian orders Thor and Mjölnir to make a scene as so she can start gathering people as materials. Seeing as he is the only one who could stop her, Thor first asks Marian who she thinks is causing all the ruckus, to which she replies that she don't know and simply gives out some logical assertions. Thor tries to convice Marian to wait and then attack when they expose themselves, tries to convince her that it may not be involved with them, and at last, tries to convince her through telling her that she might reveal her location. But Marian would not yield to Thor's reasonings, telling him to stand down and find a new hideout as he has yet to be known by their enemies compared to her. Thor gives up in convincing her, and just kicks her, making her unconscious. After felling Marian, Mjölnir is angered and prepares to attack Thor. Thor however states that Mjölnir attacking would put Marian in danger, one of the key components in Othinus' plans, which would fall into ruin upon her death. This is a fact that Thor specifically mentions to Thor would be beneficial for Ollerus, who would then find no need to kill Fräulein Kreutune, and convinces her not to let Marian out. With that Mjölnir's wrath is stayed. Thor says that he will look into how much information Ollerus' group has and what kind of traps they have in store, and states that Mjölnir should prepare so that Marian can escape. As a final measure, Thor tells Mjölnir that if there is something dangerous, she can throw Ollerus' group off by roasting an entire city block. With that, Thor leaves Mjölnir.

As she is of course represents the weapon of Thor of Norse mythology, she is later used by Thor himself. Mjölnir is used remotely by Thor. She connects to Thor and gives him a supply of energy, significantly increasing his power. He first uses Mjölnir in his battle against Silvia, and later, in his battle with Touma.

After the failure of capturing Fräulein Kreutune, Mjölnir joins Marian to leave Japan in Tokyo Bay, clattering about and supporting Marian's arguments. Here, they witness the punishment of Thor (actually Ollerus secretly in disguise) at the hands of Othinus, after giving her the organs of the original Kakine Teitoku to compensate for their failure.

Lance of Gungnir Arc
She was assigned by Othinus to assist Marian while producing the lance. As such, Thor (Ollerus in disguise) cannot use her and instead he was instructed by Othinus to head out as Almighty Thor and guard the perimeter while they are completing the lance.

While battles are going on, Othinus, Marian and Mjölnir stood at the side of a large pool filled with a thick transparent liquid which is actually pure gold that lost its chemical properties and meaning. Othinus then wondered that the sight before her is what its like when beginning the production of the lance. Marian then explains it to her and assured Othinus that all they have to do is to wait once the process starts, to which Othinus that she won't let her guard down until it passes a certain stage. She then mentions that what they are doing is essentially a magic ceremony but cannot be completed solely with magic since the automatic work will stall somewhere. To accurately throw in the holistic esper and continue the ceremony with the proper timing, it needs to be switched over manually.

When Ollerus finally revealed himself, a great roar exploded out which came from Mjolnir who is connected to Thor. At that time, Mjolnir is assisting Marian in completing the lance. It is unknown if Mjolnir got killed or not.

Abilities

 * Strong enough to take a kick from Kanzaki Kaori without any relative problems.
 * Movement at high speeds.
 * Deployment of magical weapons of a crossbow and matchlock pistols firing projectiles at supersonic speeds just less than Kanzaki's top speed.
 * The Throwing Hammer - Using the concept of swinging the hammer, the blast of concentrated energy is brought down literally disintegrating everything in her path; this technique rivals even mobile fortresses.
 * Thunder and Lighting
 * Hammer of Thor - Thor can borrow Mjölnir's power by making a link with her, apparently regardless of distance, significantly increasing his power.