Chapter 1

Welcome everybody to chapter 1 of 'Darkness of a Hero'. In this one, we will see who this mysterious woman is, and what she wants. Also, Izuku will learn how to use his new powers. And yeah, that's it for today, we can begin.

Legend:

"Talking."

'Thinking...'

Chapter 1: Unholy Power

Izuku was staring wide eyed and gaping at the woman that closed her eyes again to continue her nap. "Who are you!? More importantly, how did you get here!?"

The woman groaned as she sat on the bed and the covers fell from her body, revealing her naked body. Izuku quickly covered his eyes and looked away as a furious blush took over his face. The woman stretched her arms as she yawned "You are so loud. And what's up with looking away? My darkness cover my boobs and pu-"

"Okay! Okay! I get it!" Izuku interrupted her as he peeked and saw that indeed her... intimate parts... were covered by the same matter that healed his wounds. "S-So, how did you get here?"

She shrugged and pointed to his window that was broken. Izuku gaped "You broke my window!"

"You can get a new one, right?"

"T-That's not the point! I-It is wrong and-"

"Izuku? Are you talking with someone?" Inko asked from the kitchen and Izuku stopped.

"D-Don't worry mom! With a friend!"

Izuku sighed and turned back to the woman that was staring at him with a lazy expression. "S-So, do you have a name?"

"Derieri." She said "And they send me to train you or something like that."

Izuku blinked 'Train him? By who? Does she have my same quirk? Is this even a quirk? What is-'

"What are you doing?" She asked seeing him start muttering making him stop.

"S-Sorry... I tend to do that."

"Whatever. I found a good place to start. Follow me." Derieri said as she jumped out of the room, through the broken window, as wings made out of the dark substance sprouted out of her back and flew away.

Izuku was there, standing in his room, in shock. He quickly ran to his closet, got changed into his most athletic clothes, and left saying he was going for a run.

*1 Hour Later, Dagobah Municipal Beach*

"What took you so long?" Derieri asked as she was laid in middle of all the trash. Izuku was there watching her, not feeling tired at all. This was the most he ran in his life, and he felt like he just walked from his room to the bathroom.

"W-Well, it is hard when you take off flying."

"And why didn't you follow me doing the same?" She asked, in a tone saying it was obvious to do.

"I just got this thing. I still don't know how to use it." Izuku explained and Deideri sighed.

"Right... I forgot. Anyway, I am going to teach you how to use the demon clan powers. First thing-"

"WOW! D-D-Demon clan?" Izuku interrupted her and she glared in response, making him jump back.

"Yes. Now don't interrupt. Like I was saying, the demon clan powers for high-class demon is more durability, a better condition, like what you call, super strength and that, and the power of the darkness. Questions?"

Izuku nodded meekly "Y-Yes... the darkness, is what saved me from my fall?" Deideri raised a brow but shrugged.

"I guess. This back thing I have is darkness." She said pointing to her chest "It can heal you, morph into different things, and increase your attack and defense. Anything else?" Izuku shook his head and Deideri nodded and pointed to a car "Good, now crush that metal thing."

"T-The car!?"

"If that's its name, yes." She said before glaring at him "A problem with that?"

Izuku straitens up "N-No!" He went next to the car and placed both hands over it. He gulped and putting all his strength, he pushed.

With a loud noise, the car went down, as Izuku watched with wide eyes. "H-How?..."

"You might want to learn how to control that." Izuku turned to Deideri that walked towards him. "If you don't, you might kill by accident."

Izuku paled and gulped as he nodded and the training continued.

*Line Break*

It took Izuku 5 days to learn to control his strength. 5 days where he broke almost everything, he touched, doors, forks, plates, tables, Kachan's arm...

Yeah... Deideri pushed him to that.

Now, it was finally time to learn how to use his darkness.

He was tired. With Deideri with no other place to go, she decided to stay in Izuku's home. Well, more like in Izuku's room. She doesn't ask for much.

The bed and good food.

Izuku gave her both of those. And for his troubles, he sleeps on the floor.

"Just focus and it should move."

"Eh?"

Deideri gave him a bored look "Your darkness should be like part of your body. An extra limb or an extension of one. With that logic, it should be easy." She said before rubbing the back of her head "That's how I was taught."

"That sounds... pretty cool, Deideri." Izuku said and Deideri shrugged.

"If you said so, now go back to work."

Izuku nodded and looked at her again. He convinced her to go in one of his mom old bikinis, but she only wears them on the street. It isn't great, but it is a step above being naked, he guess.

It was one of those swimsuits that they give at schools, it still says 'Midoriya' and everything.

Now it was time to use his darkness!

*3 Days Later*

In three days of training, he only learned to use his darkness to heal himself. It is more about when to use it, instead of how to use it.

"Okay, remember what I said." Izuku said as he was preapering to leave. Deideri was laid on his bed reading an All Might comic.

"Stay in the room, if going out wear the thingy, and to not talk to your mother." She said as she turned the page.

Izuku sighed "Well, see you in a week Eri." Deideri stopped reading and looked at him.

"Eri?" She asked and Izuku blushed as he rubbed the back of his head.

"Yeah... it is a nickname. I think it is cute and it fits you. Do you like it?"

She blinked at him, before laying back in the bed "I don't mind it."

Izuku smiled as he went outside to the bus that will left him to the camp.

Back in the room, Deideri, got bored of the comic and decided to take a nap. She closed her eyes and a small smile formed on her face.

"Eri..."

"...I like it..."

And done! That was chapter 1 of 'Darkness of a Hero.' Now, before you comment, yes, I know that Eri is already a character in the MHA universe, but, this will affect in the future. Believe me. And, yes, Deideri is the pairing, I think it is original, and almost not used. I got the idea from a oneshot in Wattpad. But anyway, next chapter, I will introduce more characters from the Seven Deadly Sins. Who? Well, I already said it here...

And that's all! Remember to leave a Review that it helps my motivation, PM me for any doubts or suggestions, Follow and Favorite to know of any updates.

Till Next Time.

Roy D. Harper.