Yeah, 2 Chainsaw Man ideas in a row, what you gonna do about it?
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Determined Hunter: (Chainsaw Man Harem x Male Chara Reader)

Reader Info:
Fate was cruel...no doubt about that.

Your father died before you were born and your mother was an abusive alcoholic bitch.

You were beaten nearly every day and given very little food.

Despite your conditions, you were a strong individual and very durable.

You learned from a very early age that crying doesn't solve anything.

If you did cry or scream that only earned you a harsher beating from your mother.

You never cry or scream anymore no matter how severely you were injured.

Even enduring the many beatings you would receive when your mother forced you to go out and make money for her to buy more booze.

Despite your harsh life you never gave up on anything, you were determined to keep living.

As you got older, you became stronger and your hatred for your mother grew.

One day she was really out of it and grabbed a knife to stab you, but since she was drunk and you were much stronger you simply crushed her wrist, took her knife and killed her having finally had enough.

You enjoyed every loud scream as you thrusted the knife into her flesh, you never stopped smiling, and even after she was dead you didn't feel a bit of regret.

After that you lived on the streets, but it didn't matter, with your mother gone it felt as if a weight had been lifted.

You felt free.

You did what you had to do to survive for quite some time and after killing your mother you were pretty much desensitized to murder.

You never hesitated to kill if the need arose, in fact you very much enjoyed murder, you felt strong taking the life of another.

One day however, you came across a group of thugs who were busy carrying a kicking and screaming child to a van.

Seeing that child getting dragged off, helpless, scared and screaming triggered something in you.

You rushed in and murdered each and every one of them leaving the child alive.

The child was terrified at first as you gave him a cold glare, but it faded when you started walking away.

The child then suddenly grabbed you by the wrist and thanked you for saving him.

That was the first time anyone thanked you for anything and it felt...nice.

You blushed out of embaressment and said:

"Your welcome."

The kid introduced himself as Asriel Dreemurr and he asked if you could walk home with him.

Asriel Dreemurr:

Unable to resist his pleading eyes you gave in and walked him home.

There he introduced you to his parents, Toriel and Asgore and after Asriel explained what happened the couple were extremely grateful to you for saving their son and invited you in for a meal saying it was the least they could do.

You were shocked by this kindess but even more shocked when Asriel left out the part about you murdering the thugs.

He most likely knew mentioning the murder would make his parents cautious or send you away.

He really trusted you that much.

During your meal with this family, you wanted to cry, but held back as to not make them worry.

After the dinner, they even offered to let you stay the night in their spare bedroom.

That night, in a soft and warm bed you let the tears flow.

This was the kind of life you wanted so desperately.

You wanted to feel loved, you wanted a family and now that you felt it, you didn't want it to end.

Unfortunately you couldn't stay, you were a Murderer and having you around would probably get them into trouble and so you left the next day after thanking them.

While resting at a park bench a few days later you met Asriel and his family once again.

They asked how you were doing and you lied once again telling them you were fine.

The Dreemurrs were apparently having a picnic and they wanted you to join.

You accepted and spent most of the day with them.

However, it all came to a rather horrifying end when while walking home with them an odd man suddenly came up to you all and knocked you out.

You woke up eventually and you were  strapped to a hospital bed with that strange man glaring down at you.

He introduced himself as the Science Devil, Dr W.D Gaster.

Dr W.D Gaster the Science Devil:

You immediately demanded to know what he did to the Dreemurr family.

He responded by showing you the locket that belonged to Asriel and he said they were gone.

You were apparently out far longer than they were.

You demanded to know what happened to them and he explained that as the Science Devil he was driven.

Driven to research and study everything.

Right now he wanted to study the human soul and all it could do.

Apparently back in Ancient times humans were capable of utilizing soul magic or whatever, you were too distracted by the rage you had towards this bastard.

He killed the only people that showed you any kind of kindess and you would make him pay.

The Dreemurr family, Toriel, Asgore and Asriel couldn't handle the types of experiments performed on them and they turned into dust.

They weren't the first either, Gaster made that clear to you and you were his next subject.

Thankfully you were far more resilient than them and you managed to survive the experimentation.

Unfortunately this meant you were through extreme agony.

Odd liquids were injected into your veins, painful machines were hooked up to you and there was nothing but pain.

Through it all though, you never cried or screamed and this actually earned you some respect from Gaster, though it meant nothing to you.

One day, something odd happened to you, a glowing heart appeared on your chest during a test and you manifested a glowing red knife and Gaster immediately knocked you out.

Gaster was ecstatic, you had unlocked the ability to use your soul, now he just needed to place you in his Soul extractor so he could rip the soul out of your body and further study it.

Soul Extractor:

Before he could however, his base was suddenly broken into by Devil Hunters and he was forced to leave you behind.

You woke up in a hospital and came face to face with this woman.

Makima:

She introduced herself as Makima and the reason she was here was because of the glowing heart on your chest.

However, you just demanded she make you a Devil Hunter.

As you demanded this, the heart symbol on your chest glowed more intensely.

You were determined to find Gaster and kill him.

The Science Devil would pay for what he did, you'd make sure of that.

Makima, fascinated by this decided to let you become one and from there you began training.

Using soul magic you could do many things, but there are 2 things you neve told anyone about.

The ability to reset and level gain.

With level gain, each individual you killed, be they human, Devil or animal would make you stronger.

And reset allowed you to change fate.

If the need arises you have the ability to reset, which means rewinding back to a certain point with all your memories.

This gives you a chance to completely change the outcome of something.

In addition to that the world functions like an RPG, various clothes, items and other things have stats and give you certain benefits.

You can also heal any wound you receive by simply eating food.

While you can use other objects as weapons you do prefer knives, though guns are a close second.

The blade of knives you wield turn red and can seemingly cut through anything as well as send out rifts of red energy which can also seemingly slice through everything.

Guns you wield have unlimited ammo and instead shoot out yellow bolts of energy.

Ballet shoes make you more agile and enhance your kicks to the point where you can break through boulders with kicks.

Over many years of hunting Devils with a desire to find Gaster and end him you began to loosen up a bit.

Especially after meeting Aki and Himeno who while at first you found strange eventually grew to like.

You wanted to protect them and everyone else who you became close with.

You vowed you wouldn't allow anyone you love to die and defend them to your dying breath

No matter what...you would stay determined.

Theme song:

Harem:

Fem Denji:

Power:

Makima:

Himeno:

Fem Aki Hayakawa:

Reze:

Kobeni Higashiyama:

Quanxi and her Harem:
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And there we go.