Ryuko Tatsuma/Synopsis

History
Ryuko Tatsuma is a Pro Hero known as "Ryukyu" who managed to end up in the top ten of Japan's best Heroes, reaching the ninth position. At some point she hired Nejire Hado to work at her Hero Office.

Sky Egg Arc
On the occasion of Captain Celebrity's return to the United States, Makoto Tsukauchi decides to organize a farewell show at the Tokyo Sky Egg, inviting several of Japan's most famous heroes to participate, with Ryukyu being one of them. During the show, she participates in a pageant in her dragon form along with Midnight, Uwabami, and Mirko. Best Jeanist uses his Quirk to manipulate a large cloth to dress and decorate the heroines.

However during the event, the Tokyo Sky Egg is attacked by creatures known as Bombers, sent there by villain Number 6 to assassinate Captain Celebrity. Ryukyu and numerous other Heroes go out to face the creatures. Collaborating with Mirko, she manages to defeat one of the Bombers.

In retaliation for the Heroes' intervention, Number 6 causes a Bomber to self-destruct in a large explosion, causing the building to collapse. Fortunately, All Might arrives in time to avoid catastrophe, saving thousands of lives.

Shie Hassaikai Arc
Upon Nejire's recommendation, Ryukyu hires Ochaco Uraraka and Tsuyu Asui. Days later, after witnessing how Nejire, Tsuyu, and Ochaco take down two giant villains, Ryuko praises them and notes that Nejire improved the timing of her attacks. Ryuko then proposes that she deems them all fit enough to take part in Sir Nighteye's team request.

Ryuko is among the Pro Heroes and their sidekicks present at Sir Nighteye's meeting. As Nejire asks Ryuko what the meeting is about, Ryuko tells her that Sir Nighteye is about to explain. Nighteye explains that he has been investigating a Yakuza group known as Shie Hassaikai, whose leader Overhaul, had recently become involved in drug trafficking and had contacted the League of Villains.

Thanks to the fact that Fat Gum and his Trainees defeated some villains connected with the Shie Hassaikai, a special bullet was recovered. This bullet content allows to eliminate the gifts temporarily. After examining the contents, they discovered that inside the bullet were human blood and cells. Ryukyu surmises that the bullet contained the DNA of a Quirk that destroys other Quirks. Sir Nighteye adds that Izuku and Mirio encountered Overhaul's daughter Eri, who had bandages running up and down her legs, and suspects Overhaul is using Eri to create the Quirk Destroying Drug. This revelation disturbs everybody and Ryukyu expresses sadness and shock over the thought of Chisaki using his own daughter to create weapons.

After the explanation, they all agree to rescue the girl. During the following days Ryukyu participates in the investigations to find out Eri's whereabouts, until Sir Nighteye discovers that she is in the Shie Hassaikai Compound. The next morning at 8:00 AM, in front of the Police Station, Heroes partaking in the rescue operation have been given detailed information about the Shie Hassaikai's complex underground facility and and the Quirks of the people who are part of the organization.

At 8:30 AM, the Heroes and Police Force are outside the Shie Hassaikai's Headquarters and commence the operation. While the heroes and the police forcer waited outside, suddenly, the gates smash open courtesy of Rikiya Katsukame and he begins to attack them. Ryuko turns into a dragon, and easily intercepts Rikiya’s punch with her draconian claw. Ryukyu orders her Heroes from the Ryukyu Offices to deal with Rikiya and asks the other groups to move on. Ryukyu smashes the large Shie Hassaikai member to the ground as the other Heroes and Police Force members start storming into the headquarters.

Ryuko’s group managed to overpower Rikiya and knock him unconscious. Ryukyu orders the Police Force to restrain Rikiya while Nejire Hado, Ochaco Uraraka, and Tsuyu Asui prepare to head after Sir Nighteye's group. Suddenly, Ochaco and Tsuyu along with the Police Force become tired due to Rikiya inhaling their vitality, much to Ryukyu's surprise since she thought she knocked him out. Conscious, Rikiya reveals that the drug he took is kicking in which has enhanced his Quirk and now he can absorb a target's vitality simply by inhaling.

Now larger and stronger than before, Rikiya attacks the Police Force only for Ryukyu to take them to safety. 20 minutes pass and Ryukyu's group is in a standstill against the rejuvenated Rikiya. Only Nejire continues to fight against him.

Suddenly, "Izuku Midoriya" appears and states that he called reinforcements and that their objective is underneath a nearby crossroad. With this information, Ryukyu hatches a plan, transforms into her dragon form, and charges at Rikiya. With the help of Ochaco, Tsuyu, and Nejire, she crashes Rikiya against the point indicated by Izuku, collapsing the crossroad, and causing Ryukyu's group along with Rikiya to fall down right into the Yakuza's underground pathway, in the middle of the battle between Izuku and Kai.

Actually, the Izuku of the surface reveals to be Himiko Toga, who used her quirk to impersonating him. With her are Twice and a copy of Mr. Compress, whom they sent to capture Eri, but Ryuko notices the presence of the League of Villains’s members. While Izuku continues fighting against Kai, she destroys the Mr. Compress clone and sends Ochaco to the surface to get a seriously wounded Sir Nighteye to the ambulance.

Izuku manages to defeat Kai and the mission ends in success, Eri is rescued and the organization dismantled. Ryukyu orders the police to call ambulances for the injured and asks them to search for the League of Villains as well, although Himiko and Twice manage to escape. Ryukyu also takes a moment to thank Izuku for his incredible bravery. With that, the rescue mission completed at 9:15 AM.

Remedial Course Arc
Unfortunately, Nighteye died from the injuries he sustained in his fight against Overhaul, which is why at the beginning of October, Ryuko Tatsuma attends his funeral along with the rest of the heroes and the students who participated in the Hero Work-Studies.

Due to what happened, they are informed that the Hero Work Studies program is postponed for the moment, so Ochaco, Tsuyu and Nejire say goodbye to Ryukyu.

Pro Hero Arc
Months later, the Hero Billboard Chart JP is shown, and it is seen that Ryuko has dropped a rank of the ten best heroes in Japan, dropped from the ninth to the tenth position.

During the ceremony, when she gives her opinion on how she feels about her ranking, Ryuko honestly says she does not feel worthy to be in the top ten, because there are lives she could not save and promises she will continue to strive to be a hero more befitting of the rank. Her words move the hero Crust, who tries to cheer her up.

My Hero Academia: Heroes: Rising
In the aftermath of Nine's invasion on Nabu Island, Ryukyu goes to the island as backup for Class 1-A, who defended its residents from Nine and his crew. Ryukyu is seen carrying an injured Ochaco to safety.

Endeavor Agency Arc
During the second round of Work-Studies, Ryukyu employees Ochaco, Tsuyu and Nejire once again. Back at Ryukyu's agency, Ochaco shows off her upgraded costume, which is met with praise by Ryukyu and the others. She hosts a small welcoming party to celebrate the students' first day back.

The next morning, Ryukyu and her interns watch a news report about a forest fire in the country of Kaflin, which was said to be caused by the explosion of an illegal Trigger factory. As Nejire explains to Ochaco and Tsuyu what Trigger is, Ryukyu expresses concern that the drugs may have been moved before the factory exploded, destroying evidence and interrupting investigations. She later gets a team-up request from Selkie, and tells her students to get ready to head out. Ryukyu and her students meet up with the Oki Mariner Crew at a harbor on the Verize Islands.

Selkie, surprisingly, tells the students and Sirius to relax and have fun on the beach. Ryukyu asks Selkie why they didn't go to work immediately, to which he says that he wants to boost the girls' morale from the stress that comes with hero work, as well as that the smuggling ship probably won't make a move until it's dark. As the sun set, Tsuyu and Ochaco join Selkie and his crew on the Oki Mariner while Ryukyu and Nejire go to patrol the skies.

Sirius provides Ryukyu and Nejire the coordinates to the smuggling ship, only for one of its crew members to unleash a massive smokescreen to block their view. One villain then attempts escape by flying a plane, which Ryukyu cannot catch up to. Ochaco manages to get onto the plane and subdue the villain, but has trouble maintaining the plane's flight. Ryukyu tells her to make the plane weightless, and motivates her not to give up when Ochaco doubted if she can pull it off. Ryukyu blasts gusts of wind to propel Nejire, who in turn uses her Quirk to set the plane back on track, letting Ochaco use her Quirk and stop the plane. Ryukyu grabs the plane and safely lands it.

Later, while the girls relax on the beach once more, Ryukyu and Selkie discuss about how the Trigger smugglers were just couriers with no idea about the intentions of their employer, who used a fake name to remain anonymous. Selkie states that the drugs were headed for Otheon, a country in Europe, but declares that it's fine since they seemingly managed to halt their plans.

My Hero Academia: World Heroes' Mission
The World Heroes Association invites the Ryukyu Agency to be part of a global operation against Humarise, an anti Quirk cult that had caused the death of thousands of people by detonating a Trigger Bomb. The entire agency travels to France to join the country's Task Force.

The objective of the mission is to assault all the branches that Humarise has in the world, arrest its members and seize all the Trigger Bombs that they can find. The France Task Force successfully storm the Paris branch, but while dozens of cultists are arrested, no Trigger Bomb is found. The same goes with the remaining branches raids, so the WHA Director orders all the teams to stay in their assigned countries.

While they standby, they watch on the news that Izuku has been accused of a mass murder, resulting in putting him on the Otheon most wanted list. Ryukyu shows her support for Ochaco and Tsuyu, who refuse to believe the accusations, assuring them that Endeavor and his team are doing everything they can to clear Izuku's name.

Days later, Flect Turn announces that they have placed Trigger Bombs in various countries, including Paris, and that they will explode in two hours. Paris citizens are panicked and cause numerous accidents. Ryukyu and her team immediately head out to help, leaving Ochaco and Tsuyu in charge of rescuing the civilians, while she and the rest of her sidekicks focus on finding the Trigger Bombs. As they search, they are reported that Izuku, Katsuki, and Shoto plan to storm Humarise's main headquarters to defuse the bombs.

The deadly weapon is found near the Eiffel Tower, hidden in a truck. Ryukyu and her team head there, but the area is guarded by members of Humarise, leading to many fights against the heroes. As she struggles with a Humarise member with a giant Smilodon quirk, she orders Ochaco and Tsuyu to take the bomb somewhere safe, but more members of Humarise appear to prevent it.

The heroes continue to fight until the countdown finally reaches zero, but fortunately none of the bombs explode, indicating that Izuku's group had managed to stop the detonation. After this, the heroes defeat the last remnants of Humarise, and Trigger Bombs is taken into custody by the police. Ryukyu congratulates her team for their efforts. Once the crisis is over, the entire Ryukyu Agency returns to Japan.

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. Ryukyu is part of the team of heroes led by Endeavor in charge of raiding on Jaku General Hospital, and arresting Dr. Kyudai Garaki, ally of Tomura Shigaraki and creator of the Nomu.

Shortly after beginning the operation, Dr. Garaki releases a large number of Nomu to confront the heroes. He even frees the High-End Nomus to gain as much time as possible to wake Tomura, who is stasis in his secret lab after undergoing an operation to obtain more power. In spite of everything, the heroes manage to prevail and enter the lair. Ryukyu and other heroes use their abilities to restrain the High-End Nomu, Woman, allowing Endeavor to land a finishing blow that decapitates her instantly.

All Nomu are defeated and during the confrontation, the capsule that contained Tomura is destroyed before Kyodai could reactivate his heart. Facing his defeat, a heartbroken Dr. Garaki declares that the Devil's Dream has finally ended.

However, against all odds, Tomura Shigaraki awakens, despite having previously verified that his heart was not beating. Seeing the situation, he immediately uses his decay, which spreads rapidly through the laboratory, disintegrating everything in its path.

Ryukyu rescues and carries Eraser Head, Manual, Rock Lock and several other unnamed heroes in her dragon form before the place ends up completely disintegrated. Unfortunately, most heroes die from Tomura's Decay. Tomura's Quirk is so powerful that it destroys the entire hospital and the mountain it is on, reaching the city nearby.

Despite knowing of Tomura's power increase, Ryukyu is one of the Heroes who challenges him, when he heads to the city to face Deku. Ryukyu flies up to Tomura and swipes him with her claws. Tomura touches her claw as it approached to destroy her, but Eraser Head uses his Erasure to cancel Tomura's Quirk, and Ryukyu knocks Tomura into the air.

Ryuko calls Endeavor to attack Tomura, but the villain manages to avoid the flares. Ryukyu flies towards Endeavor to assist him but Tomura uses his enormous strength to slam Endeavor into her, sending them both plummeting into the ground. Tomura then stands triumphantly on the defeated Endeavor and Ryuko while raising his right arm in the air similarly to when Endeavor raised his left arm in the air after defeating Hood, as a sort of mockery.

Endeavor tries to strike him again but Tomura dodges and moves away from him, heading towards Eraser Head to kill him, because his Eraser Quirk prevents him from using all his power. Izuku, Katsuki, Endeavor, and Gran Torino try to stop him, while Manual and Rock Lock try to drive the injured Eraser Head away from Tomura.

Despite their efforts, they are unable to stop him, and Gran Torino is seriously injured, enraging Izuku. Tomura runs towards Eraser Head but Ryuko appears and manages to grab him with his gigantic Draconian hands. Izuku joins her to hold the villain in place. Tomura, however, pierces through Ryuko's claws carrying a couple of Quirk-Destroying Drugs. The hero sees that he is holding the bullets between his fingers and warns the others.

Izuku hits him to stop him, but Tomura manages to throw off two bullets. One is destroyed before it reaches its target but the other hits Eraser Head in the right leg, who quickly cuts it off before the drug could spread throughout his body.

Despite not having managed to remove the Quirk from Eraser Head, all that does get him to close his eyes a bit, allowing Tomura to unleash a shock wave to break free of Ryuko's grip. Ryuko is knocked out by the shock wave, and Tomura, after getting rid of her, flies straight for Eraser Head, dodging Endeavor's blow. Izuku and the newcomer Shoto manage to prevent Tomura from killing Eraser head, but not from hurting him in the eyes, preventing him from using his eraser Quirk on Tomura again.

Now the villain can use all his Quirks without interruption, but because he has been awakened prematurely, his body isn't able to keep up with All For One's incredible power. Determined to finish as soon as possible to recover, Tomura attempts to use his Decay Quirk again to finish everyone off, but an enraged Deku activates One For All at 100% and jumped into the air carrying Tomura and all the Heroes with Blackwhip.

Izuku places his allies on the ground, while he continues to hold Tomura in mid-air so he cannot use his Decay, while striking him with all his might to defeat him. While Manual and Rock Lock take care of the wounded Ryuko, Eraser Head and Gran Torino and try to take them away from the battlefield. Izuku continues to strike Tomura with 100% of One For All, until the villain's regenerative capacity reaches a limit and he can't take it anymore. But even with that and the assistance of Endeavor, who burns Tomura completely, the villain continues struggling, seriously injuring Endeavor and Katsuki as well.

After one last clash, Izuku reaches his limits, but inexplicably Tomura can still continue fighting despite the punishment received. At that moment Ingenium and Nejire Chan arrived to help the heroes. When Nejire sees her mentor Ryuko injured, she glares at Tomura, and together with Shoto attacks Tomura.

Tomura is finally unconscious, but just at that moment Gigantomachia arrives carrying several Paranormal Liberation Front lieutenants on his enormous back. The conflict continues when Mirio and Best Jeanist also team up to stop the villains. While this happens, Manual and Rock Lock manage to take the wounded to the medical camp where the wounds are treated, before returning to the battlefield, but unfortunately Tomura and a few lieutenants manage to escape.

U.A. Traitor Arc
In the aftermath of the Paranormal Liberation War, All For One has escaped from Tartarus, and proceeded to break into several more maximum security prisons, liberating the inmates. Due to the chaos inflicted by Gigantomachia and the mass breakout of prisoners, 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. Ryukyu is one of the few heroes remaining and does his best to stop the villains and apprehend them as much as she can.

In the Kansai Region, Nejire, Tamaki, Fat Gum, and Ryukyu have just defeated a villain and rescued some civilians, planning to take them to Shiketsu High School. Ryukyu states that if the number of people keep dwindling, there will be a drop in available information for them, with Fat Gum saying that now there will be no more sneak attacks and raids at each other, with everyone gearing up for the Final War.