I own neither Boku no Hero Academia nor Tokyo Ghoul. Please be nice, this is my first attempt at anything other than poetry in a long while.
Hello, i'm Izuku Midoriya.
Our world is a super-human society unlike any other, a world of ghouls and heroes. Since ancient times ghouls have hunted from the shadows. Using their built-in weapons, also called kagunes, the ghouls killed and ate the humans. But what other choice did these ghouls have, they could not eat anything other than human flesh, at least not without making themselves ill.
The humans fearing these predators tried to fight back the best that they could since then, they used a variety of methods, but their progress in hunting ghouls didn't come to their apogee until humans finally evolved a means of fighting back. The humans developed superpowers called quirks, these quirks allowed them to fight the ghouls powers with their own and put the two species near equals in terms of combat ability.
The ghouls were always fewer than number than the humans. With the advent of quirks ghouls were forced into hiding, and the number of attacks became increasingly more rare. Some ghouls did eventually develop quirks, but those were relatively few and far between. A rare occurrence caused some ghouls to lash out, but it was one ghoul family with quirks that proved the species saviors. This special quirk, Demi-plane Creation, resulted in the creation of a hidden domain that existed far beyond the eyes of human society.
Humans however were also turning their quirks on each other. Given the potential dangers of quirks, new laws were set in place to control them. These laws limited the use of quirks in public and helped give rise to a new profession: heroes. The job of heroes involved not only saving people from disaster zones and capturing villains, but also hunting any remaining ghouls they could find.
Two other changes occurred in both ghouls and humans during the advent of quirks. The first was that all members of both species gained a secondary gender, also called a 'class'. There were three classes: alphas, betas and omegas. alphas were dominant breeders;betas could get pregnant regardless of their primary gender but were less interested in sexual activities than alphas or omegas, and omegas…. We'll get to that in a moment.
The second change was that most individuals gained what became known as a soulmate tattoo or birthmark. A person's soulmate mark, if they had one was connected to the quirk of their soulmate (if their soulmate had a quirk that is), as the person's soulmate developed their quirk, marks resembling the soulmate's name would develop on the arm or wrist of the person. These marks initially would start as little more than small illegible glowing lines. The more control the soulmate had over their quirk the more the more legible the mark would become.
Anyway, like betas, omegas were capable of getting pregnant regardless of their primary gender. But only omegas could produce litters. However there were several conditions for an omega to producing a litter: An omega could only produce a litter by breeding with an alpha, but only if that alpha was his or her intended soulmate. If an omega were to breed with either a beta or an alpha that was not their intended soulmate the omega would still get pregnant, but only with a single child (in much the same way as a pregnant beta) rather than a litter.
Relating to the above information there are several key laws:
It was illegal to be a ghoul
Ghouls could not be heroes
It was illegal to be the soulmate of a ghoul
These laws were why my family had to leave Mustafu. My father, the now deceased Hisashi Midoriya was a ghoul, and my mother was his human soulmate. I, Izuku Midoriya, despite my love for the hero profession ( I love everything except the ghoul-hunting part), am a half-ghoul. I inherited my father's kagunes, but not my mother's quirk. And my soulmate… I… I have to protect him even if that meant leaving. He's safer in the human world without me there, without my tattoo to expose him… to destroy his dream of becoming a hero… oh Kacchan i'm so sorry.
There you have it, there's the Paralogue. Please review.