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All Might's Secret Love Child

Summary:

Just as Dabi gets ready to dance, Endeavour asks him in important question .... one which raises far more questions than answers.

(Takes place during Dabi's Dance.)

Notes:

Hello, welcome to my latest one-shot!

This one's special since it's my first fic where there isn't any major romance. If you've seen the tags then there is a mentioned romance but otherwise there's nothing.

This fic is actually based on a prompt I recently made on r/BokuNoHeroFanfiction.

Hope you all enjoy :)

(See the end of the work for more notes.)

Work Text:

On top of the fallen form of Gigantomachia, Dabi stood with cheer. The heroes may have gone on the offensive and captured many members of the Paranormal Liberation Front, but his own personal goals were nearing completion. 

He'd had it all planned out for years, but finally the plan was becoming reality. All he needed was for Endeavor to be present for his big reveal. 

Thankfully the new Number 1 was here, having come to stop Tomura Shigaraki from doing whatever he was going to do. Dabi knew what he wanted to do, but also didn't care. It was all secondary to his own desires. 

"Hey, there you are!" Dabi greeted, waving down at Endeavor. "I'm all the way up here, Everyone looks like tiny little ants!" 

"Dabi" Endeavor growled. 

Dabi grinned, getting ready to use the liquid in his can to turn his hair white again. However before he could do so Endeavor interrupted him.

"Dabi, answer me this. Are you All Might's secret love child?" Endeavor asked. 

Silence followed. Everyone, heroes and villains alike were completely silent, stunned at the sudden and random question. 

Izuku Midoriya looked at Endeavor and sighed, remembering a similar conversation he'd had with Shoto Todoroki some months ago. As he thought about this he looked at Shoto, who looked back at him whilst clearly thinking of the same thing.

Dabi himself just stared at Endeavor, unable to comprehend what he'd just heard. Bakugo likewise was doing the same. 

At first Spinner just blinked repeatedly whilst letting Endeavor's question rattle around his head. Much of his attention was on the unconscious Shigaraki. Not only was Spinner worried about his friend, but their only means of escaping this was by Gigantomachia who would only obey Shigaraki's words. 

Still, whilst he had his priorities he still couldn't help but speak up. 

"Hold up, why would you think that Dabi is All Might's son?" Spinner asked in confusion as he tried to wake Shigaraki up. "There's literally nothing connecting them." 

Endeavor scoffed "That's incorrect, there's a lot connecting them. Without the burns their smiles are similar, their hair is also similar - without the really long bits of All Might's hair. Their also both very powerful with mysterious quirks that nobody knows the name of, or at least All Might used to be powerful." 

"Wait is that it?" Spinner asked "Seriously? That's really basic connections, and terrible ones at that. 'Oh if you change All Might's hair style a bit then they have the same hair' - yeah of course dumbass, that's literally how hairstyles work! Do you have any ACTUAL connections between them?" 

"Of course!" Endeavor declared, looked very annoyed at Spinner's rant. 

Bakugo snorted "Oh this'll be good." 

"Dabi's also clearly been trained to use his quirk and has a grudge against hero society. My theory is that he's the son of a Pro-Hero who couldn't control his quirk properly and likely had a poor relationship with his heroic parent, likely due to neglect. Thus he became a villain to get revenge, but what led me to seeing it as All Might is that Dabi joined a group led by villains who wanted to oppose All Might specifically. Not only that be he pays a lot of attention to myself and my son, clearly to show All Might that he sees us as more important than his father." Endeavor explained. 

Dabi narrowed his eyes at Endeavor, looking increasingly pissed off. 

"Huh" Shoto said, nodding in thought. "That does make sense. I can see why he reached that conclusion, even if he's wrong." 

Izuku looked absolutely tired of it all, and heard a sigh of frustration from the person right next to him. 

Spinner also sighed, responding with "I guess that's a better argument, but Dabi joined the League because of Stain. He's literally said that multiple times ... what do you think, Dabi?" 

Dabi had been staring at Endeavor throughout the explanation, confusion, anger and amusement warring within him. He shook his head as he heard Spinner speak to him. 

"I have no idea where you got that idea from" Dabi spoke to Endeavor. "Especially since Katsuki Bakugo is clearly All Might's actual secret love child." 

At that everyone turned to look at Bakugo, who in turn was looking at Dabi. He was clearly unsure how to feel about Dabi's theory, but Izuku reckoned he was also quite angry. 

Whilst Bakugo would never admit it, Izuku knew that deep down he loved his parents so would hate for people to assume he isn't related to one of them - even if people assumed his actual father was All Might. 

"That doesn't make sense either!" Spinner cried out in annoyance. 

Dabi waved him off "Sure it does! Their hair is the same colour, they both grin a lot, both have very powerful and destructive quirks, both have a close relationship with Izuku Midoriya ... and I've seen footage of the fight on Nabu Island. Bakugo clearly has used All Might's attacks, in clear homage to his heroic parent. He's also probably said the words 'I', 'Am and 'Here' at some point or another, just like All Might." 

Spinner looked like he was actually starting to lose it, getting very frustrated. "Oh my god Dabi, are you actually listening to yourself? Do you not think that other people have used those words before? Heck, I've used those words before - does that make me All Might's secret love child?" 

Dabi shook his head "No, of course not .... You're Mirko and Ryukyu's secret love child from their forbidden romance." 

Spinner was now at a loss for words. 

"Spinner clearly can't be their son since two women can't have a male child together. Unless Spinner's secretly female ..." Endeavor speculated, stroking his fiery beard whilst deep in thought. 

Izuku looked at Shoto again, sighing as he saw his friend to also be deep in thought. At this point nobody was even bothering to try and fight, instead they were all just standing or sitting around listening to the insane theories of Dabi and Endeavor. If Izuku himself wasn't so injured then he'd attack Dabi immediately, and he knew that Bakugo would do the same. 

Instead all they could do was watch. 

"No no no, don't you dare suggest that. I have a family and they are not Pro-Heroes or anything of the sort! Theorise about something else instead if you have to, but not me!" 

Endeavor nodded "That's a good point. Regardless of that though you still haven't convinced me that you aren't All Might's son Dabi, and I have a lot more evidence to show. It's all right here on my phone." 

As Endeavor spoke he got out his phone. Dabi got his own phone out, clearly to show the evidence of Bakugo being All Might's son. 

Then Shoto Todoroki decided to open his mouth and make everything worse. 

"Both of your theories are interesting but wrong. Dabi can't be All Might's secret love child, as he's actually Best Jeanist's son. Bakugo also cannot be All Might's secret love child, since I briefly saw his parents once when they visited U.A. I actually think Bakugo will become Midoriya's ancestor, since he will travel back in time and work with a famous martial artist to fight the first supervillain." Shoto explained calmly. 

"What the fuck, Icy-Hot." Bakugo growled out. He was promptly ignored. 

"Regardless of all that though if you're both wondering who All Might's secret love child is then I have the answer. I initially thought it was Midoriya and confronted him about it at the Sports Festival, however he denied it but admitted there was a connection. So I looked a bit further and found someone who definitely is the actual love child - my fellow classmate Tsuyu Asui, also known as Froppy." 

Spinner looked confused "Wait, isn't that the Frog girl in your class? One of those two girls who Himiko wants to date?" 

At Shoto's nod Spinner hesitated before stating "You know what, explain it to us. Why is she All Might's secret love child?" 

Izuku's eyes widened as he realised what Spinner was actually trying to achieve - he wanted to buy time for Shigaraki to wake up! Before he could warn the others though Shoto spoke again. 

"They can both jump really high, have iconic catchphrases like 'I Am Here' and 'Ribbit', and both really like Midoriya - in different ways that is. I also asked All Might what his favourite animal is and he said it was Frogs. They're both also really strong, All Might able to smash apart buildings with his fists whilst Froppy can do it with her feet. Mineta also said she could crush stuff with her thighs, but I'm not sure how that would be applicable." 

Dabi chuckled lightly "Interesting theory, but where does Midoriya fit into it? You said he was connected to All Might after all." 

"Oh that's simple. Midoriya is All Might's younger brother on their father's side. It would have to be the father's side since Inko Midoriya is younger than All Might." Shoto explained, before turning to look at Izuku with an apologetic look on his face "By the way Midoriya, sorry for revealing all this here and now. I should've explained that Tsuyu was your niece so you couldn't date her anymore .... you also might want to not date Uraraka anymore either, as I've got some evidence that she's your identical twin sister." 

Izuku stared at Shoto "I'm very confident that Uraraka isn't my identical twin sister, since y'know we're not identical at all. In fact we have different birthdays, parents, everything!" 

"... and yet you two are always together just like twins are. The Entrance Exam, the Battle Trial, the Sports Festival, the Provisional Hero License Exam, the raid on the Shie Hassaikai, the Joint Training-"

"Yeah you can stop right there." Izuku interrupted. He ignored the quiet laughter from right next to him. 

As Shoto continued explaining his theories to Izuku and Bakugo, Dabi and Endeavor continued debating whilst Spinner tried to get everyone to see reason and stop believing the 'dumb theories'. 

Mr. Compress watched all of this in amusement. He'd been expecting this all to go in a very different direction, but he was honestly enjoying the odd arguments unfolding before him. He turned to his left, looking at the only high-ranking Meta Liberation Army member to still be with them, Skeptic. 

"So what do you think of all this?" He asked Skeptic, whilst casually watching as an Owl flew by and pooped on the unconscious Tomura Shigaraki's head. Spinner likely would have stopped that if he wasn't arguing with Endeavor. 

"Ridiculous, but that's to be expected with that family. Let me show you something." Skeptic turned his laptop's screen towards Compress, with three people's faces displayed on it. "From left to right: Natsuo Todoroki, Fuyumi Todoroki and Endeavor's wife Rei Todoroki. I've gotten recordings of all of them, and do you want to guess what they're about?" 

Mr. Compress chuckled "Is it something to do with the current conversation that Endeavor and Dabi are having?" 

Skeptic didn't respond, instead clicking on Natsuo's picture which brought up a video. In the video Natsuo was clearly speaking to some other students at whatever school he attended. Compress listened with interest. 

"I'm just saying it makes sense. He has a similar hair colour, is quite casual and friendly and they both have mysterious origins. There's lots of other little details connecting them." Natsuo said. 

One of the other students shook their head, calling Natsuo crazy. 

"I'm not crazy. You're the crazy ones! I'm telling you Hawks is All Might's secret love child!" 

The video clip ended there, Skeptic silently clicking on Fuyumi's picture to bring up yet another video. In this one she was also at a school, but as a teacher. Alongside her was some other teachers, one of which asked Fuyumi to share her 'wild idea' with the group. 

"Oh you mean about All Might's secret love child? Well I actually think he has two kids - twins in fact, and you've heard a fair bit about both of them. I think Izuku Midoriya and Tomura Shigaraki are All Might's secret love children and are twins as well." Fuyumi explained calmly. 

"How do you explain the age difference?" A blonde teacher asked, clearly trying to not laugh. 

Fuyumi shrugged "Time related quirk. I heard that U.A. is caring for a girl with a quirk that can de-age someone. Maybe Midoriya got hit by it, or maybe a similar quirk aged Shigaraki up." 

With that the second clip ended, and Skeptic once more moved to click on the third picture. 

The third video, of Endeavor's wife in some sort of hospital had her speaking with a nurse. The clip was also only a few seconds long. 

"I'm telling you, Principal Nezu is the secret love child of All Might and Star and Stripes!" 

With that Skeptic silently turned his laptop away, getting back to what he was doing. Compress in turn looked back over to Dabi who was still arguing with Endeavor and Spinner. 

"Dabi's a Todoroki, isn't he." 

Skeptic nodded "Yes, their eldest son who they believe to be dead. Obviously you didn't hear this from me, but he plans to announce it now ... or well, once he's finished arguing about All Might's hypothetical child." 

------------------------

Today was honestly the most bizarre day in her life. 

As the secret love child of All Might, she'd known that some odd days could occur - especially if the truth had gotten out. 

However despite everything nobody suspected a thing. The only people who knew had been told of it either by herself or her father. Even All for One had never learnt of her existence, outside of knowing that she was a student at U.A. 

It helped that her quirk was very obviously nothing like All Might's, or at least like how One for All had been before Izuku Midoriya had been gifted it. She had some super strength and super speed as a small benefit of being the biological child of someone with One for All but she never had the quirk itself. In fact the strength and speed were just part of her naturally, and even if Mr. Aizawa had used his quirk on her she'd still be super strong and fast. 

Regardless of that though, Toru Hagakure had never taken her life for granted. She knew only some of her father's burdens, but what she did know was to always be there to help him. 

This included helping his successor. 

Toru hadn't known what to think about Izuku at first, but whilst helping her father train him she'd come to develop a genuine respect for him, and had become his first actual friend. In fact Toru honestly saw Izuku as the brother she'd never had, and made that clear as well. 

Bakugo didn't count as either the first friend or an adopted brother, especially after the 'swan dive off a roof' comment. Sure, he'd become better but Toru would never let him forget his lowest moment (that had taken a while for her to get out of Izuku in the first place). 

She'd been at Izuku's side as he slowly learned to control and harness the full power of One for All, including when he started unlocking the quirks of the previous users. She'd cautiously welcomed Bakugo into the secret when he'd figured it out, and had delighted in his increased wariness about her after learning of her heritage. 

She'd also helped get Izuku into a relationship with Ochaco and Tsuyu, so the three of them were a nice happy polycule! 

When she'd heard that Shigaraki was after Izuku she'd rushed over .... only to find Endeavor, Dabi, Shoto and Spinner arguing about her hypothetical sibling. 

Naturally Izuku and Bakugo knew she was there. She'd trained with both of them enough for them to know that. Shoto likely would know as well if he was actually paying attention. 

Instead of doing anything to help though, Toru couldn't help but watch. This truly was a train wreck of a conversation but whilst it was really weird it couldn't get any worse. Then Shoto opened his mouth.

"Dabi, I've just realised who you really are. You're my brother, aren't you?" Shoto calmly asked, Endeavor and Dabi both gasping in shock (though for completely different reasons). 

"What ..." Dabi barely got out, as Shoto spoke over him. 

"You're Natsuo Todoroki, my older brother." Shoto declared. 

Everyone looked completely shocked, except for Mr. Compress who was openly laughing. 

This included Toru, who had just learned that it could get worse. 

Notes:

Hey, thanks for reading the fic!

Having Shoto guess Dabi was Natsuo was something I came up with today, and I couldn't resist the thought of adding it.

Also you may be wondering about Hagakure's mother - well I initially planned for her to already be dead, and have Inko be an unofficial adopted mother figure.

Also the Owl pooping on Shigaraki is a fun little nod to Harry Potter's Hedwig, who in some of my fics and prompts has done such a thing.

I actually had Toru's name in the character tags, but figured it's best to not advertise her role in the fic. Since she's the only one here who isn't a Todoroki or was present at Dabi's Dance, it would make it fairly easy to guess her role beforehand.