Yu Takeyama/Synopsis

Entrance Exam Arc
Mt. Lady made her first debut as a new superhero just as Kamui Woods was about to restrain his opponent with his Lacquered Chain Prison Ultimate Move, when she swooped in, attacking the giant villain with her Canyon Cannon move, and subsequently defeating him. She then introduces herself to the awestruck crowd, proclaiming it to be her first day on the job, and is afterward swarmed by photographers and paparazzi.

Later the same day, when Katsuki Bakugo is taken hostage by the Sludge Villain, she is unable to do anything because she has no room to move in the narrow alley in her giant form. Mt. Lady uses her gigantic arms to protect the bystanders of the wind pressure caused when All Might defeated the villain with a Detroit Smash. She helps to recover the remains of the sludge villain to take him into the custody of the Police Force.

Three days after her debut, in her Hero Office, Mt. Lady has a discussion with her assistant about the insane bills they have to pay due to the destruction she caused with her gigantic form, even if they are covered by insurance. During the discussion, she accidentally activates her Quirk, demolishing her own headquarters. Afterwards, she says it's time for a rebuild.

U.S.J. Arc
She along with Kamui Woods were having trouble dealing with Habit Headgear, as he was holding hostages. That was until All Might showed up and had beaten him and saved the hostages. Although she and Kamui Woods were grateful, they complained that he'll put them out of a job.

U.A. Sports Festival Arc
Mt. Lady is seen outside the U.A. Sports Festival, having been assigned to guard security. She comments, while eating takoyaki, that all the professional heroes came to watch the event and notes that this year "is gonna be crazy".

After the rules of the Cavalry Battle are explained, Mt. Lady, along with Kamui Woods and Death Arms discuss competition and cooperation in the Hero business. The other hero says that if a hero fails, they lose any chances of surviving, and notes that the Obstacle Race is a perfect example of how sometimes one has to lower someone else to show themselves off, and Mt. Lady mentions that she felt bad for taking out Kamui Woods' enemy on her first day of work, while also asking the other hero to stop smoking, while Kamui Woods agrees with the hero. Mt. Lady then comments that sometimes heroes have to cooperate with their concurrence and that the Cavalry Battle is a perfect analogy to that.

Later, while doing her surveillance duties, Mt. Lady watches the fight between Denki Kaminari against Ibara Shiozaki, in which Ibara easily wins. Impressed by her, Mt. Lady tells Kamui Woods that Ibara would make the perfect sidekick for him, but he only responds by telling her to get back to work.

Vs. Hero Killer Arc
For the Hero Agency Internships, Minoru states that he wants his workplace to be with Mt. Lady, causing Tsuyu to think that he is having unclean thoughts, to which Minoru denies. Once there, she makes Minoru her servant, cleaning up and doing other menial labor around her office while she lazed around.

Days later, after the internship ended, Denki asks Minoru about how his experience was with Mt. Lady, Minoru answers while quivering that he knows the true nature of women now, indicating that his experience with Mt. Lady was traumatic.

Final Exams Arc
Mt. Lady is featured on a daytime talk show where she appears Midnight who is also being interviewed. While Midnight talks about her costumes controversies, Mt. Lady repeatedly interrupts her by poking fun at her need for attention. Eventually, the two come to blows over their ages, much to Minoru's viewing pleasure.

Hideout Raid Arc
Mt. Lady joins the Police Force and many Pro Heroes in the rescue operation of Katsuki Bakugo.

At the League of Villains' warehouse, Mt. Lady destroys the front of the warehouse. Mt. Lady along with Tiger, Best Jeanist, and Gang Orca infiltrate the partially destroyed warehouse and apprehend all the Nomus while Tora rescues Ragdoll. Best Jeanist informs Naomasa Tsukauchi that the warehouse has been cleared.

When All For One appears from the shadows, Mt. Lady sees that Best Jeanist is preparing to attack and warns him that the man could be a civilian. Before the Pro Heroes can act, the entire warehouse is destroyed.

Mt. Lady survives the attack thanks to Best Jeanist's quick thinking but is heavily injured. After Izuku and his friends rescue Katsuki, Mr. Compress is flung into the air to catch them. Suddenly, Mt. Lady uses Titan Cliff and intercepts Mr. Compress, which causes them to smash into each other and prevents Mr. Compress from getting to the students. Izuku and Katsuki are surprised at Mt. Lady's intervention. The dazed heroine tells the students to escape before falling down and being left unconscious. Kamui Woods later rescues the unconscious Mt. Lady, telling her she did well.

Remedial Course Arc
Although she doesn't appear, it is mentioned that following the Kamino Raid Mt. Lady forms a hero team named The Lurkers with Kamui Woods and Edgeshot.

Pro Hero Arc
When the Hero Billboard Chart JP announcement is made, Mt. Lady is ranked No.23. In an interview during the announcement, Mt. Lady comments that being on a team with the No.7 Pro Hero Kamui Woods gives her a lot of encouragement (although privately she is frustrated at not making the top 10 while Kamui did).

When the reporter asks about the rumors of Mt. Lady and Kamui having a romantic relationship, she avoids answering the question. Mt. Lady then cried and ran to Death Arms for comfort about Kamui receiving recognition.

Endeavor Agency Arc
When Class 1-A is learning about how to act in front of media, Mt. Lady is helping since she knows how to act in front of it and tells them to use their special moves in front of the reporters. She tells the class that when they use their special moves in front of the media, they are using it to show villains that it is a warning of their presence, to heroes a key to team building, and to the citizens that they are safe. Mt. Lady then praises class 1-A for doing a great job but when Izuku Midoriya tried he becomes stiff but when she mentions that his power is similar to All Might, he bursts out talking.

Later, The Hero Public Safety Commission demand all the students heroes for all academies to undergo practical field training. Denki Kaminari, Hanta Sero, and Minoru Mineta from Class 1-A, and Ibara Shiozaki from Class 1-B join The Lurkers.

My Hero Academia: World Heroes' Mission
Mt. Lady and the Lurkers learn that Humarise has detonated a Trigger Bomb in a major city, killing thousands and destroying the entire infrastructure. In response to the act of terrorism, the World Heroes Association mobilizes the largest anti-terror joint task force. The Lurkers join the Egypt Task Force with their Work Study interns, Denki, Hanta, Minoru, and Ibara, where they meet Salaam, Egypt's top Hero.

The heroes lead an assault on a Humarise forward operating base in Cairo. Despite their successful raid, the heroes fail to locate the Trigger Bombs or any of the Humarise's leaders. The Egypt team were ordered to be on standby. During this time, they watch on the TV news that Izuku is framed for mass murder by the Otheon government. Mt. Lady seems like it's legit considering that it came from the WHA headquarters, however, classmates from Class 1-A refuses to believe that Izuku would do something heinous and voices their opinions in defense of Izuku's innocences.

The operation is compromised when Humarise publicly broadcast to the entire world that they have planted the Trigger bombs in over twenty-five cities, one of which is Cairo, and they will detonate the bombs in two hours to "cleanse" the population of their Quirks. As a result, Cairo is locked in a state of anarchy and chaos, so the Egypt team scrambled to quell the hysteria and locate the bombs.

Finally the heroes manage to find the bomb, having to engage in an all-out war against the Humarise agents who protect it. During the battle, the heroes are informed that Izuku's group intend to storm Humarise's main base in order to defuse the bombs worldwide.

The Lurkers manage to reach the bomb just as the countdown ends, but after a few seconds nothing happens, indicating that Izuku's group had managed to deactivate the Trigger Bombs in time, saving the world from catastrophic destruction. With the main threat neutralized, the heroes defeat the last of Humarise's agents and seize the device, celebrating the victory. Once the crisis has been averted, the team leave the country.

Paranormal Liberation War Arc
By the end of March, thanks to the police investigations, and the information leaked by Hawks, who was acting as a spy, the Hero Public Safety Commission organize the Heroes and the Police Force to take down the Paranormal Liberation Front. Mt. Lady, along with her teammates Kamui Woods and Edgeshot, is part of a large force of heroes in charge of raiding the Gunga Mountain Villa, the headquarters of the Paranormal Liberation Front.

When the signal is given, the heroes begin the assault on the Gunga Mountain Villa, catching the PLF members off guard, allowing the heroes to defeat large numbers of them before they can mount a proper defense. The Paranormal Liberation Front soldiers soon begin to reorganize to drive back the heroes. In her giant form, Mt. Lady is hit by several of the enemy's attacks, but all they manage to do is anger her and strikes back in retaliation.

As the battle progresses, the PLF begins to offer increased resistance. Geten, one of the main lieutenants of the organization, intervenes in the fight and with his ice he blows away Mt. Lady, which almost falls on top of Fat Gum. Mt. Lady gets back up and attacks Geten, intending to pay him back for his earlier attack.

Suddenly, Gigantomachia emerges from the ground and picks up some of the lieutenants. Mt. Lady does her best to try and hold the giant back. The giant however, ignores her presence, until he chooses the shortest route to Tomura, grabbing her by her leg and throwing her away. Kamui Woods and Midnight also try to stop the behemoth, but are defeated by the lieutenants. However, Midnight manages to convey to the students the key to stop Gigantomachia, and Mt. Lady along with Kamui Woods holding on to his left leg, slowing him down just a little bit, giving students time to set up a trap.

Mt. Lady continues to hold onto Gigantomachia while yelling at the unconscious Kamui Woods to wake up. Then, Gigantomachia falls into the trap, and the students prepare to carry out the plan to take him down, which is to throw a container with a powerful sedative into his mouth. Despite their situation, both Gigantomachia and the lieutenants manage to repel the assaults of the students.

Then several heroes who were chasing them start attacking, at the same time Mt. Lady pushes Gigantomachia down on the ground. Understanding that students trying to get something into Gigantomachia mouth, Mt. Lady forcibly opens it. Mina is about to succeed, but she fails when she sees Gigantomachia, who proclaims that he cannot waste any more time with insects and needs to get to his master, causing the girl to recognize him as the same giant she stood up to in middle school and freezing up in fear.

The behemoth grabs Mt Lady by the head and shakes her off, then savagely tosses her to the side, knocking her unconscious. When it seems that the plan of the U.A. students is about to fail, Eijiro manages to make him swallow one of the sedative. This allowed the giant to be defeated later, but not before causing great destruction in his path.

Following the Paranormal Liberation War's aftermath, All For One has escaped from Tartarus, and releasee the inmates from several prisons. The whole country entered a state of total chaos and anarchy. In addition, many heroes resigned and called it quits because of the massive criticism of their work, and the destruction spreading unchecked. Mt. Lady is one of the heroes who recuperates from all the damage in order to assist the other Heroes and help Japan in its current state of chaos.

Dark Hero Arc
Now left with a new scar across her face, The Lurkers join the other Heroes in helping Deku locate All For One. Following the boy's battle with Lady Nagant, they join Deku at the mansion in Haibori Woods although he rushes in to confront All For One and only finds a video recording of him before the mansion explodes.

The Lurkers later regroup, along with Endeavor, Hawks and Best Jeanist, revealing that they now all know the truth about One For All. Upon Edgeshot proposing that they share the truth with more heroes to widen investigations. The Mineyama Hero adds to this by explaining that following the incident with Lady Nagant, the brunt of the search and investigation is now falling solely on Deku, and with the police preoccupied with their own issues, she advises them that they should gather as many allies as they can. Endeavor however reminds her that Death Arms had retired two days prior, being unable to handle the overwhelming criticism from the public.

Best Jeanist adds that Heroes are quitting one by one, and that retired heroes are leaking whatever they know about One For All to the public, with Endeavor commenting that if the public find out the truth about Deku's Quirk, then the boy will be caught in a negative cycle. Mt. Lady questions as to why All For One didn't reveal the whole secret about One For All and Endeavor answers saying that if he did, everyone would do their upmost to keep Deku hidden from him. Endeavor then admits that they have no leads, and that all of them including Deku need to face the reality in that they just don't have the numbers to handle everything.

U.A. Traitor Arc
When Izuku finally returned to U.A. after going rogue, he and Class 1-A reunite with Mt. Lady. She reminds them that even after learning what they just dealt with, their main objective is tracking down and eliminating the remnants of the Paranormal Liberation Front and the League of Villains, and they must do it all without haste, as the class assembles and heads out.

Final War Arc
In preparations for the upcoming Final War, Shota's plan begins to take into effect. Knowing that All For One is keeping tabs on the Heroes through Search, he needed Yuga and the Aoyama Family to play their roles as infiltrators and spies for All For One. He and All Might recruited Shota's protégée, Hitoshi Shinso, to take advantage of Hitoshi's newest development of being able to make brainwashed people speak, by having him brainwash the Aoyamas so that they can deceive him without detecting a single lie.

The next step of the plan is to make use of Kurogiri's Warp Gate to allow them to warp themselves into the fight, to catch All For One off guard, as well as warp the villains to locations all over Japan, separating them. Neito was able to successfully copy and train himself using Warp Gate, and the heroes waited patiently for Izuku to make contact with Yuga. Once Yuga meets Izuku in a desolated location, All For One has finally re-emerged, and with his prize in his reach, All For One summons an army of villains to overwhelm Izuku and finally steal One For All. However, Neito uses Warp Gate to teleport the remnants of the heroes to confront the villains.

Mt. Lady is in charge of defending Gigantomachia's containment unit in the ruins of the Jaku Hospital Ruins along with the U.A. hero course students from Class 1-A and 1-B. She overheard the news that Dabi has been defeated by his youngest brother, Shoto. Mt. Lady cheers on Shoto for his success, knowing he had potential, and she and the other heroes are motivated to do the same to defeat the villains.

Mt. Lady and the Heroes put up a good fight against the Villains, however, the battle begins to fall to their side when several of the Liberation soldiers begin to float in the air away from their reach. They activate an ultra-high frequency recording of All For One's voice, intending to re-awaken Gigantomachia. Mt. Lady swipes at them, knowing he absolutely can't wake up, calling out to Yui who uses her Size Quirk to create a gigantified wrench which she attempts to attack them with. Right as she's about to, however, Gigantomachia breaks free from his containment, knocking her down as she thinks about how he embodies pure psychological scarring.

Mt. Lady tries to keep Machia at bay, all the while he continues to pound away at her, demanding to know where his master is. During this time, Eijiro seeks out Hitoshi, who had accompanied them, to brainwash Machia, but he is starting to be absorbed by the Sludge Villain. Before Machia could kill Mt. Lady with his massive claws, Mina pushes her Quirk to its maximum output, blasting out her new Ultimate Move: Acidman - Alma, which is potent enough that it melts right through the beast's hardened skin. Mt. Lady notices this, looking at Mina and thinking for her to be careful.

While Mina saves Eijiro and Hitoshi from the Sludge Villain, Mt. Lady still attempts to recover against Machia who is about to attack her with his other hand. But just then, Hitoshi uses his Persona Chords to mimic All For One's voice, causing Machia to respond to him, successfully Brainwashing him. He commands him to attack all the remaining forces in the air, relaying everything to Mt. Lady while on riding his hand.

With Machia now under their control, they have taken out all of the Villains, leading the Heroes to round up the escaped convicts and Liberation soldiers to be apprehended. However, Mt. Lady is then contacted by Naomasa Tsukauchi, informing her about the situation in Gunga with All For One. Now that his body has started to regenerate, he is attempting to flee, so they request backup in order to keep him contained. Mt. Lady leads the rest of the containment team, alongside the Hitoshi-controlled Gigantomachia, toward Gunga where they aid the remaining Heroes in engaging All For One.

Mt. Lady continues to attack while staying beside Machia, in order to protect Hitoshi and prevent All For One from breaking control of the Brainwashing. Despite their attempts, All For One is able to fire off a huge wave blast, hitting Machia and freeing him from the Brainwashing. However despite this, to everyone's surprise, Machia asks his master why he abandoned him, venting about feeling betrayed for being left behind after so long, attacking him of his old volition. The Heroes plus Machia once again throw their full assault on All For One until he vanishes for good.

As the Heroes and Gigantomachia continued their relentless assault on All For One, Mt. Lady broke her giant wrench and orders Yui to give her another weapon, but the only thing she can give was Detnerat items, which aren't useful for combat. As the growing exhaustion comes forth, Mt. Lady perseveres and calls on anything that she can use in order to hold down All For One.

However, the Villain manages to gain the upperhand and is successfully able to retaliate, sending a blast forward that slices Mt. Lady's abdomen, causing her body to fall to the ground. The U.A. students call out to her in fear, just as All For One retaliates further by brutally attacking Gigantomachia, knocking him out, and proceeding to attack everyone else. As the dust settles, all the Heroes lie battered and broken, with All For One eventually finally leaving the battlefield for Tomura's location.