Izuku Midoriya is such a bright child. Tsuna wonders where he got that. Probably Inko – Tsuna is still absolutely hopeless when it came to academics. He's glad, though, and oh so proud.
But in the world they live in, well.
It doesn't matter one fucking bit.
Perhaps he's being a bit bitter, but what can you do when the world advances so much that people begin to literally breathe fire out of their noses? It's ridiculous.
Tsuna blames Gianinni, and maybe Byakuran. Hell, even Reborn had to have a hand in this. People don't just sprout powers like some sort of genetic evolution. There was supposed to be a process.
But apparently humanity threw a big ol' middle finger to regular, reasonable biological science and decided that having a bunch of uncontrolled powers akin to having a loaded gun was okay.
No, that's not why he's bitter. He's seen weirder things, and, honestly? He's surprised it took a baby glowing for people to realize something was happening with humanity's genetic make-up.
(He's literally met people who could fly, turn into babies, use certain parts of their body into a weird mini-hammer space that could act as an inventory, and crack walls using their bare fists. Quirks were, quite honestly, not that big of a deal for him.)
The entire reason he's bitter is due to the present society and their attitude towards quirks.
Apparently effort for your own talent matters jack-shit anymore. This means that anyone without a quirk was practically living in a world where everyone would be such a toxic little shit to them.
This included his son.
Let him reiterate.
This. Included. His son.
His son, who is smart as hell and had such wonderful instincts and analysis skills that would make Reborn weep. His son, who, despite his admittedly prodigious talents, is a kind, sweet boy who always strove to help others when they need it.
His son, who, by all accounts, is quirkless.
Tsuna has gotten into many drunken rants to Inko about how fucking unfair it all was, how that, though Izuku would have been praised for his intellect around Tsuna's era, he was constantly picked on in the present day all because of something he could not help but be.
It was frustrating.
And also, kind of, maybe Tsuna's fault.
Technically, it wasn't directly his fault.
But the thing is, Skies were very rare. That much was true since the last hundred years.
This was kind of the reason why Skies got to live so long. Other than the fact that they were literally in tune with their surroundings enough to slow their aging process, Skies needed to reproduce in the most efficient way possible. Biologically, at least.
That also meant that Skies were, essentially, born pure. No impurities.
And the quirk factor? Very much an impurity that could impede and even harm Sky flames.
Quirkless people were rare, but not as much as Skies were. As luck would have it, because little Izu had such a strong Sky as his father, he would never have a quirk.
His boy was devastated to hear this fact.
The moment he and Inko came back from the doctor's, Tsuna was suddenly bowled over by a sobbing mess of green curls. The mafia don had to cut his call with Byakuran short when it was clear that Izuku would not let go of his shirt any time soon.
It took a fair long while to get Izuku to calm down enough to sleep.
But Tsuna thought, with how the world suddenly came crashing down on his precious son's shoulders, it was the least he could do to comfort the green-haired boy.
What breaks Tsuna's heart is, in the middle of the night, Izuku wakes up, sad and teary. His son asks him this.
"Dad...can I still be a hero? Without a quirk?"
Tsuna doesn't know how to respond.
"I don't know," he tells his son honestly. He quickly shushes Izuku when the boy tears up again, whimpering. "No, no, don't cry little cub, shh..." he rocks Izuku in his arms, carding a gentle hand through that wild untamed mess of curly green hair.
"I don't know if you can become a hero or not," he repeats. "But you can try, and that's all that matters."
A weak nod against his collarbone tells him of Izuku's answer, and together they fall asleep to the sounds of Tsuna's humming.
You may have a few questions about this AU.
First of all, this was based on the fanfic entitled LYING IS BAD FOR THE SOUL by Hayato (LennyFace?) on AO3.
In that AU, Skies live ridiculously long and have extended lifespans due to their flames 'harmonizing' with their surroundings. Because of this, Tsuna is not only the direct descendant of Giotto, he's Giotto's actual kid. Giotto and Nana kind of...y'know. (On that note, Xanxus is also Ricardo's son! Which makes the whole inheritance crap utter bullshit. Who knew?)
Anyway, in my story, Tsuna went on and lived beyond his peers. This isn't canon to LYING, but Tsuna leads Vongola here, well into the future even as quirks started developing. The reason Izuku doesn't have a quirk is that his latent Sky flames burned away the quirk factor impurity from him as soon as he was born. Anyone with a strong potential for awakening their flames is classified as quirkless, and everyone with a quirk can never safely activate their flames without the risk of interfering with their quirk. Either they activate their flames and lose their quirk, or risk their flames self-destructing them from inside out.
Since Izuku's the son of a man who has a strong affinity for Sky Flames, and proceeded to activate said Flames, Izuku's potential to use his own Flames is very large, interfering with his natural quirk factor.
(Perhaps it's possible that if he were ever to receive a quirk from...a certain someone, he'll be put at a huge health risk.)
ANYWAY!
out of the 20% of people who are quirkless in the world, only about 10% of THOSE people can activate their flames. Those who do are immediately snatched up by Flame Society. Largely consisting of Vongola, for obvious reasons.
Another thing is that BNHA takes place two centuries or so into the future of KHR. Tsuna still leads the Vongola. Take that as you will.
