Before I get to the story description, this is actually 2 separate stories for this series, just wanted to make that clear.
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Villainous x Male Dabi Reader:

You had always strived to be a hero, and for a good while you were one of the best heroes ever.

Past you:

However, there was severe issues going on in your family.

Your father, a hero himself was quite abusive towards you, your siblings and your mother.

You were trained brutally since the day you discovered your fire powers, you were pushed to your limits and one day an incident occurred.

You weren't immune to your own flames and you ended up getting burnt badly.

You had to be hospitalized and had to be stitched up.

You in the present:

However when your family came to get you, you were gone, according to the doctors you woke up in the middle of the night and went completely berserk before escaping.

Now on the streets you saw just how truly flawed the so-called "heroes" of your city were and it disgusted you.

So from that point onward you became a Villain, determined to purge the world of false heroes and get revenge on your father.

You eventually caught the eye of the Black Hat organization who were very impressed with your work.

This organization worked to help Villains defeat their heroes and you have defeated many heroes so they asked you to join them.

Of course you accepted.

Love Interests:

Demencia:
This pretty little psycho fell for you the moment she saw you in action.

Your brutal efficiency, badass attitude and utter hatred towards heroes was a real turn on for her.

She is pretty much your stalker and will attempt to spend as much time with you as possible much to your annoyance.

However, you can't help but find her a tiny bit cute and weather you'd admit it or not you do care about her.

G-Lo:
She was your former partner back in your hero days and she developed a crush on you.

She was truly devastated to hear what happened to you and that devastation grew when she saw what you had become.

She believes that there is still some good in you that can be saved while you view her as one of the few good heroes left in the world.

You both still share a deep bond and G-Lo no matter what still has feelings for you.

G-Lo believes she could have done something to prevent this outcome and blames herself for what happened to you even though it really wasn't her fault.

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Villainous x Male Overhaul Reader:

Reader Info:
You are the leader of the new Yakuza.

They were once the most feared crime family ever, but ever since the rise of heroes the Yakuza had been nearly forgotten.

This is something you refuse to accept, you would make sure the Yakuza would rise once again and control the world like they used to.

How you'd do that would involve a little girl who was the granddaughter of the Yakuza's last boss Eri.

Eri:
(A/N: In this story you won't be abusive towards Eri like Overhaul is in BNHA. You treat her like a daughter)

She was born with a very special power that would help you completely erase the powers of heroes not only letting the Yakuza rise once more but also pave the way for other Villains to take over as well.

You just needed a bit of help to further your research and so you made an offer to the Black Hat organization to help each other out.

They help with your research and you give them the ability to further their cause of helping other Villains.

This deal was accepted and your partnership began.

Love Interest:

Fem Black Hat:
The head of the Black Hat Organization.

She honestly thought she'd never feel love at all, but you changed that.

You were both taken with each other and through helping each other with missions you grew even closer.

Once you find a way to erase the powers of other heroes, you both will rule a world of Villains as King and Queen.
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And there it is, what do you think?