Tatsumaki/Synopsis

History
Tatsumaki's psychic abilities eventually led to her being taken away from her adopted family at the age of seven by a group of scientists called Tsukuyomi, who were interested in studying her powers. Her parents were given money for complying. She was tested on by the scientists because of her extraordinary powers. They rewarded her with candy and toys for cooperation, but denied her requests to go outside. Moreover, the scientists locked her up in a cell whenever she wouldn't use her powers. 18 years ago, when she was 10, a monster outbreak occurred while she was still locked in a cell, leaving her alone to fend off the monster. Luckily, Blast managed to come to Tatsumaki's rescue. He then introduced himself to the young esper and questioned her on why she didn't use her psychic powers to save herself. Tatsumaki answered that her powers weren't working, but Blast realized that she was lying because she held it back so that the scientists would deem her useless and let her go. Tatsumaki admitted this, due to being heartbroken by her parents for selling her out. Blast also somehow realized that Tatsumaki still had her little sister, giving her advice not to expect anyone to save her next time, and be strong to protect her only family.

An unknown number of years before the events of the main story, Tatsumaki saved Fubuki from bullies at their school, launching a kid who tried jumping on her into the air. The rest of the kids ran into the school building, but Tatsumaki retaliated by momentarily lifting the entire building into the air. She then told Fubuki to either come to her or retaliate when she was being bullied.

After a while, she encountered and battled Otento and held a grudge against him until today.

Rumored Monster Arc
Tatsumaki visits the Z-City branch of the Hero Association to see if she can investigate the restricted area of Z-City. However, she is informed by Busho she didn't need to come, since the Association thought that an S-Class wasn't necessary for the job. She leaves, calling Busho an idiot. Later, after both Golden Ball and Spring Mustachio return badly injured, Tatsumaki is enraged and yells at the worker saying she should have gone. The worker shows her a picture of the destruction, saying even she might have had a hard time. Tatsumaki tells him she could handle it then calls him an idiot again.

Alien Conquerors Arc
Tatsumaki is sent to the mountains by plane to fight the Ancient King, only to be called back to the Heroes Association Headquarters by cellphone, which angers her greatly. She quickly ends the fight by sending a meteor crashing down on the Ancient King.

Tatsumaki later meets Saitama at the Hero Association HQ due to Bang inviting him to the Hero Association S-Class Meeting. She becomes indignant at his presence, asking who let Saitama in, pointing out that he is a lower-ranked hero, and accusing him of only coming to the meeting to see the S-Class heroes up close. A perplexed Saitama mistakes her for a child and asks if she is lost, prompting Genos to explain her identity. Genos observes that most of the S-Class heroes have arrived and goes to take his seat, causing Saitama to ignore her, much to her chagrin. Upon the meeting's inception, Bang asks what the heroes were called to the meeting for, to which Tatsumaki states that she had to wait for two hours without hearing an explanation. During the alien invasion of A-City, Tatsumaki prepares to set out to engage with the enemy and their aircraft. Because of King's moniker of "The Strongest Man on Earth", fellow S-Class hero Superalloy Darkshine asks for King's opinion on how to deal with the spaceship, but King states that they can't do anything due to the ship being too far away. Tatsumaki deems this answer pathetic and decides to take down the spaceship alone, rudely declining Genos's offer to assist.

At the site of the Heroes' engagement with Melzargard, the aircraft of the Dark Matter Thieves fires cannons towards the ground in an attempt to eliminate Bang, Atomic Samurai, Metal Bat and Puri-Puri Prisoner, only to be intercepted by Tatsumaki, who redirects them back at the aircraft. In the midst of the battle, Tanktop Master attempts to help her by throwing concrete blocks at the enemy, until he realized that Tatsumaki's psychic ability can do more than Tanktop Master could ever accomplish on his own. The spaceship eventually falls, though she is not convinced it is because of her doing. After the fight is over, Saitama bursts out from the wreckage, and is asked by Tatsumaki if he came on his own. He ignores her and starts a conversation with Genos. Angered by being ignored, she starts insulting Saitama and slams Genos against a wall after he addresses her as a brat in retaliation. Bang stops her when she is about to attack Saitama, telling her to act properly as an S-Class hero.

The Blizzard Group Arc
Tatsumaki makes a brief appearance in Fubuki's vision.

Monster Raid Arc
Tatsumaki causes an explosion in the city where Do-S and Fubuki are fighting. When she arrives, she immediately tells Fubuki to go home and that she will handle the rest. Do-S orders her love slaves to attack Tatsumaki as a distraction as she escapes. Tatsumaki immobilizes all of the love slaves and tells Fubuki that they will only get in her way and to not call them her allies. She then takes off to find the rest of the monsters.

Super Fight Arc
She later appears arriving in I-City, killing a wounded Hundred-Eyes Octopus, much to the chagrin of Flashy Flash. She berates the heroes and then leaves as Flashy Flash tries to argue with her.

Tatsumaki is one of heroes seen fighting against monsters, when Suiryu is calling for help.

Monster Association Arc
She is shown to be summoned by the Hero Association to attend meeting to prepare for the operation of attacking the Monster Association. With her usual superiority complex, she brags that the Monster Association is just a bunch of cowards and if they were not, they wouldn't prove a match against her.

When she is briefed about the situation by Sekingar, she suggests reducing Z-City to rubble to kill all the Monsters while disregarding the life of the hostage.

The S-Class heroes, Tatsumaki, Child Emperor, Kamikaze, Pig God, Flashy Flash, Superalloy Darkshine, Zombieman, Puri-Puri Prisoner and Sekingar attend a meeting and they reassure Narinki that they will rescue his son. They each receive a transmitter that will show their location to each other. She gets into an argument with Sweet Mask on who wants to lead the strike force. Ultimately, the situation is calmed by King who arrives from Z-City.

The Hero Association strike team heads out to Z-City to confront the Monster Association. At the ghost town within Z-City, the battle begins as Tatsumaki fights Evil Eye. She kills the monster, twisting it into oblivion.

She heads into the Monster Association HQ at her assigned route. Later she is seen challenging Gyoro Gyoro. She manages to quickly gain the upper hand over Gyoro Gyoro in their fight. She puts up a barrier to protect herself from Orochi's electricity.

When she hears Orochi was killed by a bald dude, she wonders if it was Darkshine. At the end of her fight with Gyoro Gyoro she tears a humanoid figure out of its body and realizes that Gyoro Gyoro is really Fubuki's friend turned enemy, Psykos.

Tatsumaki quickly realizes that the humanoid is nothing more than another meat puppet, and that Psykos's actual body is located deep underground. She quickly locates Psykos and pulls her up in spite of the latter's attempted resistance. After momentarily questioning Psykos on Tareo's whereabouts, the two clash, and Tatsumaki easily restrains Psykos and interrogates her for intelligence. After receiving the requisite intel, Tatsumaki briefly argues with Sweet Mask via transmitter, refusing to help the idol hero against an executive member, but is cut off by Orochi, who reappears and attacks her. As Tatsumaki fights Orochi, she wonders if he's a cadre and expresses frustration at the inability of the other heroes to rescue Tareo, stating it would be easier if she could just destroy the base. When Psykos forces Orochi to merge with her, Tatsumaki continues fighting, but quickly realizes that Psykos's psychic power has increased substantially. She sustains moderate injuries in her struggle to hold Psykos and Orochi off, but receives word from King of Tareo's safety. Tatsumaki declares that she no longer needs to hold back and begins to unleash her full power.

Using the location of the transponders, Tatsumaki encloses the underground heroes in psychic barriers and lifts them up to the surface, with the exceptions of Zombieman, Flashy Flash, and Saitama, who do not have transponders on them. After ensuring their safety, she pulls the Monster Association base aboveground, flying out of a building moments before the fusion between Psykos and Orochi emerges. Tatsumaki notices that Psykos is absorbing energy from the tendrils on her and Orochi's lower body. She attempts to drill through her now that they're outside, but is shocked when Psykos unleashes a beam of incredible destructive power, momentarily cutting off a sliver of the planet. Tatsumaki wonders where Psykos's power is coming from, and when told of Psykos's plan to absorb every life form, deems it stupid and mocks her. When Psykos attacks, Tatsumaki flies between the energy beams of her dragons, staying high above the surface as to keep the line of fire away from the ground. She notices King leading Tareo away from the battle and mentally praises him for leaving the battle to her. She then lifts several large rocks out of the ocean and hurls them at Psykos, attempting to trap her. Psykos breaks out, and a whirlwind of rocks and energy fills the sky as the two unleash their power. However, Tatsumaki then decides to create a dummy using rocks and imbue it with her esper power to distract Psykos amidst the rocks flying everywhere. While Psykos attacks the dummy, Tatsumaki flies to the bottom of the uprooted Monster Association base and enters one of the tendrils of Psykos and Orochi's root system, muting her psychic signature as to not be detected. She then flies up to Psykos's main body, commenting on how it's hollow from the inside, and quickly destroys it by twisting it. She then decides it's time to pull out the infiltration squad, extricating Atomic Samurai and Puri-Puri Prisoner from the building.

However, before she can finish the job, both her hands are impaled by the blades of Psykos and Orochi's quickly-reforming body, and she is hit with a powerful jolt of psychic power. Psykos charges up another powerful energy beam, but Tatsumaki is saved by Genos, who launches an energy beam of his own to intercept. As Genos takes on Psykos and Orochi, Tatsumaki angrily tells him to get out of the way, stating that King left her this responsibility. Genos responds that King only left her the job until Saitama's arrival, adding that it's the disciple's duty to help with the teacher's work. He then tells her to attack Psykos and Orochi's body while he handles her energy beams, and the two heroes begin their battle against the monster. Psykos attempts to attack Tatsumaki with another energy beam, but Genos counters it with beams of his own and tells Tatsumaki to hurry up and rescue everyone else. She does so, pulling out Child Emperor, Sweet Mask, Superalloy Darkshine, Fubuki, Bang, and Bomb. Psykos attempts to finish off a now-weakened Genos, but Tatsumaki blocks the energy beam and tells Genos he did a good job, although he rudely responds that he didn't do what he did for her. Tatsumaki then restrains Psykos and twists the entire city in an attempt to fully destroy Psykos's monster form. Suddenly, blood spurts from her nose and her psychic power begins to fluctuate due to her overusing it. Psykos transforms Orochi's remaining form into a jet and flies away, simultaneously releasing a smokescreen and creating a number of decoys. Tatsumaki counters this by creating a large barrier around the battleground, preventing Psykos from escaping. Psykos attempts to fire an energy beam through Tatsumaki's heart, but realizes too late that she attacked a decoy. Upon finding Psykos, Tatsumaki prepares to fight, but their battle is interrupted again, this time by Drive Knight, who has transformed himself into a fighter jet. While Drive Knight and Genos protect an unconscious Tatsumaki from Psykos, she has a flashback to when Blast rescued her 18 years ago, remembering Blast's advice to not expect anyone else to save her. She wakes up to Fubuki sending her a telepathic message that she and the S Class are coming to rescue her. Tatsumaki says to not underestimate her and locks on to Psykos and Drive Knight's signal coming from inside a tunnel. She collapses the ceiling in an attempt to impede Psykos, but this is ineffective as Psykos quickly transforms her jet to maneuver around the debris.

After shaking off Genos and Drive Knight's attacks, Psykos proceeds to fire an energy beam in a final attempt to eliminate Tatsumaki, but the beam is intercepted by a massive boulder thrown by Tanktop Master. As the remaining S Class heroes attack, Tatsumaki prepares to finish Orochi, pulling a rock formation in the shape of a spear out of the ground. She charges up the spear with psychic energy and launches it at Orochi while spinning it rapidly, shredding the monster to pieces. The spear drills into the ground all the way to a mysterious altar. When Atomic Samurai expresses concern about Flashy Flash, wondering if the latter was still underground, Tatsumaki telepathically informs Fubuki that he wasn't down there, thinking to herself that she sensed a warp in space that swallowed someone up and wondering if Blast had anything to do with it. Later on, Tatsumaki is being chased by Homeless Emperor, who creates and sends countless energy spheres after her. In the stream of lights, she manages to create a decoy and swap it with her before being seemingly cornered and defeated. Tatsumaki soon appears in front of Bang, Bomb, Fubuki and Genos, in an exhausted and weakened state. She is aware of Fubuki's injuries, and becomes enraged at believing that Child Emperor and Sekingar let her sister participate in battle despite telling them not to before, and proceeds to angrily ask Fubuki who had made her suffer. Fubuki, however, replies to her that it was Fubuki's own doing, with Tatsumaki calming down and telling her to leave. As Fubuki tries to stop her from returning to fight, Tatsumaki psychically pushes her back. Despite Tatsumaki disregarding her, Fubuki still wants to save her big sister, reasoning that Fubuki herself is also a hero, while attempting to restrict Tatsumaki's movements using telekinesis.

Tatsumaki instantly frees herself from Fubuki's hold on her and binds her along with Bang and Bomb using the same psychic technique. Before leaving, she responds to Fubuki that while she is happy that Fubuki has indeed grown, she cannot afford to think that she will be saved by anyone, leaving Fubuki in tears for failing to stop her sister. She soon arrives where Pig God and Tanktop Master are at, and manages to stop Fuhrer Ugly from killing one of the members of the Narinki's Private Squad by restricting the monster's movements with her telekinesis. This buys the other two heroes time to save all the mercenaries, Bushidrill and Okamaitachi. However, due to Tatsumaki having been heavily injured and in a weakened state, she is unable to hold back Fuhrer Ugly any longer as the latter escapes her bind and knocks her back to a nearby rock, where the monster then walks up to her after defeating Tanktop Master.

Before Fuhrer Ugly can get his hands on her, Bang and Genos arrive, with the former distracting the ugly monster by attacking Gums, saving Tanktop Master from the gluttony monster and causing Fuhrer Ugly to switch his focus on the martial artist. After Bang and Genos manage to save Tatsumaki and Tanktop Master from those two Dragon-level threats, she is being carried by Genos to her sister's whereabouts, hoping Fubuki to heal her injuries. While carrying Tatsumaki and Tanktop Master to Fubuki, Bang and Genos are blocked and attacked by Black Sperm, who replicates itself into many clones to corner them. Atomic Samurai comes to their aid and tells them to take her and Tanktop Master to safety. As a group of many clones are still chasing them, Tatsumaki regains her consciousness and helps Bang fend off the monster so that Genos can escape with Tanktop Master. Later, with some other heroes and the Council of Swordmasters having come to assist, Tatsumaki, together with them, fends off countless copies of Black Sperm. During the battle, a massive Black Sperm bursts out of the ground and catches her, attempting to crush her. However Genos, who has just returned after transferring Tanktop Master to Fubuki, manages to save her by incinerating the clone. Several more clones form up behind Genos and slam him into the ground, but the cyborg immediately makes use of his suit's burial escape functionality to get back on his feet, telling Tatsumaki that it uses the data from when he fought her. She teases Genos, saying that it was thanks to her he has become stronger, much to his annoyance. Together, they prepare to face off against Black Sperm. Unfortunately, due to Tatsumaki having completely exhausted from her previous fights and Genos not having the capability to fight off so many clones of Black Sperm, they are overwhelmed by the monster, with the cyborg having all of his limbs torn off. Despite Tatsumaki telling him to leave and run away, Genos still desperately tries to protect her, shielding her with his own damaged body and refusing to resort to self-destruct as to not risk her life. As she and Genos are surrounded by the black monster and in a life-and-death situation, King appears in front of them with his King Engine running, prompting Black Sperm to stop in his tracks. Later, Tatsumaki and Genos are saved and moved away to safety by Puri-Puri Prisoner, which Child Emperor then notifies King of and tells him to quickly release his Ultimate Hellfire Burst Wavemotion Cannon and annihilate Evil Natural Water and Platinum Sperm.

Psychic Sisters Arc
Tatsumaki shows up at the building where several other monsters are being held with the intent to kill Psykos. The Blizzard Group attempts to hold her back with psychic binding, but she easily incapacitates them. She bursts into Psykos's holding cell and asks why the former Monster Association head is still alive. Fubuki attempts hold her back, telling Saitama to take Psykos and run. However, Tatsumaki easily breaks out of the bind and chides Fubuki for letting her heart grow weak, stating that the two of them don't need anyone else and calling the Blizzard Group weak. Fubuki gets angry at this and attacks Tatsumaki with her Hell Cluster. Tatsumaki is unharmed by the onslaught of rocks and proceeds to tell Fubuki that she will have her younger sister retire from hero work and take care of everything for her from now on. She restrains Fubuki with her psychic power, but Fubuki uses Psychic Whirlwind to break out and momentarily block Tatsumaki's psychokinesis. Fubuki then unleashes Hell Storm, but this attack again proves ineffective, failing to harm Tatsumaki. However, Tatsumaki recognizes Fubuki's improvement and praises her for her strength, momentarily surprising the younger esper. However, Tatsumaki goes on to say Fubuki doesn't need friends and that she'll cut off the Blizzard Group for her younger sister. Before she can go any further, she is stopped by Saitama, who jumps out of the building with her to avoid more damage. She gets angry at Saitama and proceeds to attack him. Speed-o'-Sound Sonic gets involved, still hunting Saitama and promising to defeat him. He is quickly taken out. Her wounds from the Monster Association battle open up, so she stops fighting. Like in the case of Garou, she said that if she was at top strength, she could flatten Saitama in 5 seconds. He asks her why is she a hero and why she keeps others away, only for her to reply "Because.. Bla-" but then decides it's not worth it to respond. She reminiscences about the time where she was saved by Blast 18 years ago when she was young after a monster had escaped. She then asks herself, "When will you be back, Blast?"

Neo Heroes Uprising Arc
Tatsumaki is later dispatched to P-City to take on the Dragon-level mysterious being Aggregation. She expresses disgust and shock as the mass of insects splits and begins to attack. Ultimately, she beats the monster without suffering any injuries, but she notices that the monster managed to destroy the entire city and thinks to herself that humanity won't survive unless they take preventive measures against future disasters. The next day, Tatsumaki is called to the Hero Association HQ, where they inform her of an sinister esper organization known as Eleven, led by a figure named Otento who is after Tatsumaki's life. Tatsumaki states that Otento's name is a sickening memory, and agrees to actively pursue Eleven, stating that she's already been looking for them.