Tomura Shigaraki vs. Cathleen Bate

Tomura Shigaraki vs. Cathleen Bate is the battle between "Tomura Shigaraki" against the American Pro Hero Star and Stripe.

Prologue
After the events of the Paranormal Liberation War, the hero society of Japan had fallen. Using his influence and contacts abroad, All For One made his overseas associates and foreign villains cause enough trouble that the other nations were reluctant to send some of their heroes to Japan to help, prioritizing their own safety. However, America's number one hero, Star and Stripe, disobeyed orders to stay in the country and went to Japan along with a squadron of fighter jets.

All For One wanted to get a hold of One For All first and then Star and Stripe's Quirk, New Order. But with her decision to come to Japan, he is forced to changes his priorities. All For One wants to get Star's Quirk, but above all, he wants to prevent her and Izuku Midoriya from meeting. For this reason, he makes the decision to send "Tomura Shigaraki" to confront her, even though it poses a great risk because his body is still incomplete.

Just as Star and her squadrons are about to reach the Japanese archipelago, they are "welcomed" by "Tomura", riding a flying Near High-End Nomu. She asks him if he is the villain mastermind called "All For One", which he simply replies that it's a good question, asking what exactly is he. The Bravo leader reports to Star and Stripe that the person in front of them is actually Tomura Shigaraki, and because he can use EMP blasts, they order all units to deploy shock shields to protect the planes and disengage the autopilot. He then asks the hero if they are going to attack or retreat, to which she replies that he shouldn't even have to ask: They Smash!

Battle
With the order given, the fighter jets quickly take a battle formation. Meanwhile, "Tomura" talks to himself, saying that he has a strange feeling, since although he is undoubtedly aware that he is Tomura Shigaraki, at the same time he feels that he is someone else, whether that be All For One or even Tenko Shimura. With little time to think about this, he combines the Quirks Radio Waves, Air Cannon, and Heavy Payload, to release an enormous air blast in order to take down the jets. Star orders the fighter pilots to evade the attack as she jumps off the plane she is standing on.

Everyone dodges his attack, but "Tomura" teases Star about who will be the first to touch the other. Star and Stripe ignores his bravado as she lands on a jet, and without hesitating even a moment, she uses New Order and proclaims that there will be no air within 100 meters ahead of her. This creates a star-shaped atmospheric vacuum void around "Tomura" and the Nomu. "Tomura" has to hold his breath while his body is affected by the sudden lack of atmosphere. He thinks about how terrible Star's Quirk is, making wanting it even more desirable.

Knowing that is not enough to finish him off, Star orders her squad to attack. The pilots start firing lasers at "Tomura" from all angles. They believe that they have won but Star and Stripe reminds them not to be overconfident. "Tomura" uses Reflect and Scatter to shoot the lasers back from many directions, while his body regenerates. One of the reflected laser beams hits Star and Stripe, but does nothing to her as she uses New Order to hold it. By doing this, the void around "Tomura" disappears, allowing him to deduce the limitations of Star's Quirk.

Seeing his chance, "Tomura" stretches his arms, allowing him to blast his way forward toward her, but Star and Stripe simply jumps forward as well, punching him in the face. Star is already aware that her Quirk is limited to two rules, one of which is always enhanced physicality applied to herself.

Before they both land on top of another plane, Star tells "Tomura" about how All Might saved her life as a child, being her inspiration to become a hero. "Tomura" curses upon hearing someone speak of All Might once again. The hero wastes no time on using her Quirk on the villain, placing an order that Tomura Shigaraki's heart will stop if he moves at all.

To her surprise, the Quirk has no effect on him. Without her knowing it, with the fusion of the wills of Tomura Shigaraki and All for One, a new entity is being formed. Within him, Tomura's vestige struggles with his master's taking control of him with no avail. All For One continues to tell him to let his hatred flow as it will deliver their glorious future. "Tomura"'s hair suddenly grows long, as he once again thinks back to his old family home, where his hatred grew. With his rage growing more and more, “Tomura” generates a powerful explosion.

Star is thrown backwards due the blast, confused by what had just happened, and notices that "Tomura"'s hair has grown. For his part, "Tomura" proclaims that he has finally deduced how New Order works exactly. One of the pilots allows Star to land on his topside, and asks her what they should do, to which she tells him to send a message to Commander Agpar. The pilot is surprised by this because he knows what it means but Star replies that "Tomura" is not only a threat to Japan but to the whole world.

The pilots comply and begin to maneuver. The pilot of the ship "Tomura" is standing on shakes him off, leading him to land back on the flying Nomu. Star then uses New Order to solidify the air around her and form into her shape, but 1000 times bigger, in order to use her Super Move: "Fist Bump to the Earth", knowing that the only way to defeat him is to completely reduce him down to nothing.

Mimicking Star's movements, the colossal form punches "Tomura" and the Nomu, sending them flying. It then crushes them with a clap of its hands, but it's still not enough to defeat him. Star orders the pilots to fire their lasers at her to combine them into a single beam with New Order. Using her gigantic air construct to utilize "United Hyper-Max Output Laser: Keraunos", Star pins "Tomura" to the sea bed while burning him with the concentrated energy.

One of the pilots thinks that with that last attack, "Tomura" will finally be terminated, but Star replies that if that was possible, Endeavor would have been able to finish him off. Suddenly, Star receives a call from Commander Agpar, who scolds her for acting on her own and warns her that her punishment will be more severe than the simple loss of her hero license. She doesn't care and asks him if he is done with the preparations. Agpar replys in the affirmative and that the intercontinental cruise missiles codenamed "Tiamat" are en route to her position.

The Tiamat missiles soon make their way to the battlefield and one of the pilots asks Star if she can use them. Star replies that she will have to give up the laser rule for what she wants to do next, and tells the fighter pilots to direct their lasers towards "Tomura" while she tries to grab the inbound missiles. Despite being constantly burned by the gigantic laser, "Tomura" deduces that it is not the final blow, and that Star only uses it to stun lock him, and that she is preparing to launch an even more powerful attack. Tomura decides to take advantage of that.

Star manages to have her gigantic air construct grab the missiles mid-air with precise timing and uses New Order to redirect the missiles, at the loss of her laser rule. With that, "Tomura" attempts to escape but is pinned down by constant laser fire from the fighter jets, and, not long after, is hit with a "State-of-the-Art Hypersonic Intercontinental Cruise Punch," causing an explosion visible from the mainland.

Looking down at the crater left from the punch, Star sees a hole in the middle of it. Immediately afterward, a charred "Tomura" emerges from it. He knew Star was about to hit him with "something dangerous" and used his Decay Quirk to dig a hole in the ground, and he thinks that should he have been a second late, he would have died. It turns out the Nomu "Tomura" rode into the battle on was used as a decoy while this all happened, while stating he was playing along with their game and that if anyone else was hit with the missiles, they would be done for.

He commands the Nomu to burst, distracting the pilots long enough for him to jump forward towards Star, using the jets as platforms, claiming that "me and myself" will use Star's resources better than her. Witnessing this, one of the fighter pilots tells Star to end "Tomura" by destroying his aircraft, however she can't bring herself to do it, resulting in "Tomura" grabbing her face.

Using her real name "Cathleen Bate," Star attempts to stop herself from decaying using New Order. However, as this rule is beyond the upper bound of her Quirk, she only manages to slow down the Decay. "Tomura" is delighted and states to Star that her body began Decaying when he started stealing her Quirk, prioritising herself and losing her Quirk in the process.

Now with the power of New Order, "Tomura" is about to try and manipulate the air, but is interrupted by the vestige of Star confronting them within the All For One Quirk, while "Tomura" begins exploding from inside. The pilots witness this and realise that Star has affected "Tomura" in some way. It turns out, that at the last second, she declared that New Order would revolt against other Quirks. All For One curses her name, while Star's vestige begins ripping away at the other vestiges, causing mayhem for both Tomura and All For One.

Star thinks about the worst case scenario for the fight at hand, which is her dying and her Quirk being stolen, and while she would have liked to protect both, she is willing to give it all up to stop a worldwide threat like "Tomura." With that, she thanks her friends, the fighter pilots, for what they have done for her. "Tomura" thinks about the Quirks fighting against each other within him, and understanding that he can only give or take Quirks, not dispose of any, he tries to find someone he can palm New Order off to.

In an instant, all the fighter pilots begin barraging "Tomura" with laser fire, exclaiming that Star is still fighting within him and that her sacrifice shall not be in vain. The Reflect Quirk "Tomura" possessed is then destroyed by the Star and Stripe vestige, as its rampage continues. Star gives in to the Decay, and in her final moments, she thinks about All Might and how he saved her, and because of that, she was able to indulge in this dream of hers. All For One curses this "specter of All Might" as the fighter pilots continue with their laser fire.

Stealing the wing Quirk from the Nomu, "Tomura" desperately escapes from the battlefield in an attempt to get rid of New Order, as it continues to go on a rampage. Cursing All Might once again, he makes way to the mainland, away from the pilots flying in pursuit. Reaching a pier at the mainland, "Tomura" breaks into the safehouse of escapee Kashiko Kashi and his fellow former inmate. "Tomura" touches his face in an attempt to make him Quirkless, so that New Order can be safely deposited within him, preserving it.

However, before he can attempt to, the vestige of Star and Stripe mocks "Tomura", stating that thanks to the Quirks New Order has revolted against, it has resulted in the death of her final embers. As her vestige begins to fade away, she says that despite not being able to kill him, as long as people are willing to stand up against him and to save each other, his end will be upon him. All For One retorts that the winner is the one who lives the longest. While this is all happening, deep within "Tomura," Tenko Shimura, surrounded by hands, calls out to Izuku Midoriya.

Aftermath
Soon after, an extensive search party is sent out to find "Tomura," but he was already gone. The world is shaken by Star’s death, and that every country has withdrawn their support from aiding Japan to focus on protecting their nations instead, in fear of a social breakdown from any attacks, much to the dismay of several Pro Heroes.

The fighter jet pilots meet with the Japanese heroes and authorities and inform them that not all was in vain, as their X-66 Jets have a record of the battle, and were able to measure all of "Tomura" bio-signatures, providing the data to them to use. With this new information, alongside the ones already being studied at Central Hospital, they deduce that "Tomura" will take at least one more week to be 100% complete, thanks to Star buying them that extra time. All Might informs Class 1-A about this, and advises them to prepare to take down All For One and Tomura Shigaraki once and for all.