Aizawa x Child!reader (Chainsaw man)

The Big 3

It was a couple of weeks of just getting used to transforming into your quirk form. Now, it was time to train you to get it under control.
It was about 6 a.m., and Aizawa was waking you up from your slumber.
"Kiddo, get up. It's time to come with me to work again." He said, rubbing you awake. You groan in response and hide under the covers. He sighs and leaves the room, only to have his scarf reach under the blanket and pick you up.
"Nooooo, it's cooold!" You try reaching for the blanket to wrap yourself up, but Aizawa holds you in his arms as he drinks his coffee. His warm body instantly makes you relax, his scarf retracting from your body back to around his neck.
"I know it's cold, don't worry. I have a sweater ready and warm for you to wear." He said, continuing to sip on his coffee. You humph and ask for breakfast, which he gestures with his cup to behind him. Pancakes with strawberries and banana on top were waiting as he let you down to eat.
You sit down and say 'thank you' before getting a fork and digging in. He hums and reads a few graded papers before sitting next to you.
"Today, we're gonna try something different with you at training today. Midnight is going to be there, as well as Allmight." He sips slowly, letting you take in the information. You look up at him with your mouth full and nod. He smiles softly at how cute you look with your mouth stuffed full.
"Didn't I tell you to slow down on eating? Don't want you choking." He said humorously, but you didn't know it was a joke and slowed down on chewing.
"Hey, it was a joke, I'm happy you're eating normally now." He reassured you, putting his hand on your shoulder. He turns to the clock and looks at the time. It's almost time to go.
"Alright, kiddo, about finished?" He stretches in his seat as you finish the last bit of the pancakes, nodding and taking a sip of milk. You also stretch up and race to change. Today, you're wearing a red and white striped one-piece, with blue overall shorts on top. You also have red sneakers to match, and the sweater is handed to you as Aizawa puts his sweater on, too, in his full hero outfit. You take his hand out the door, and off you went.

"I'm not gonna lie. It's going to be a challenge today, ok? I just wanted to tell you beforehand that you might be really tired afterward." He says while driving. You nod at his words and continue looking out the window until UA is in sight. He parks the car and gets out to unbuckle you. You also brought along the black cat squishy you got a few weeks ago. The two of you headed into the building, where you grab Aizawa's leg softly, mostly out of habit. He smiled softly at your reaction, allowing it until the bell rang and the halls got too crowded, and then he picked you up again.
"Hold on, ok?" He said. You grabbed his shirt and looked over his shoulder.
A few minutes later, the halls were empty, and class had begun, Aizawa walked into class 1-A and greeted his class.
"Hello students, today I want to introduce the top 3 3rd years of this year in the hero course," He said, putting you down near his desk, "They're gonna take care of (y/n) for this class, for its exam day for you lot." A chorus of groans could be heard. Aizawa chuckled to himself and motioned the 3 students outside the door to come in.
2 bright and smiling students came in, Mirio Togata and Nejire Hado, followed by a very timid Tamaki Amajiki. The 3 of them venture into the classroom loudly, capturing the eyes of Class 1-a.
"Hello there, young heroes! I wish you well on your licensing exams! You're gonna need it, haha!" Mirio nervously laughed. Nejire also spoke,
"I'm Nejire Hado, and this is our kitten, Tamaki Amajiki. He's shy, but he's a great and strong hero." She smiles brightly. You took a peek at the three students before Aizawa picked you up in front of the class and handed you to Mirio, who tried to pat your head. You just stared at him like he was crazy.
Luckily, he got the hint and stopped. Nejire decided to squish your cheeks, causing you to groan and try to pull away. She giggled and smiled at you. Tamaki didn't even try to greet you. He was just staring into the wall. After introducing themselves, they left with you. Aizawa watched as you left on Mirio's shoulders and then turned to his class.
"Alright, exam time."

It was a few minutes of walking upstairs, Nejire was asking a bunch of questions to you, none of which you answered. She slightly pouted but lit up once she got an idea.
"Do you like cartoons?" She asked brightly.
You tilt your head in question and asked her what cartoons were. Her and Mirio looked at you like you were crazy and immediately pulled out their phones to show you. The art style really captured your eyes, and the funny noises made you giggle. This happened all the way to the children's play room in the school.
Once they reached the room, they hooked up the big TV, and they got the beanbags our and sat with you to watch them. You were entirely interested in the shows, while Tamaki and Mirio got snacks. Nejire stayed with you to not feel alone, so she watched the cartoons with you, also entranced by the animation.
Tamaki and Mirio came back with food from the vending machines, plenty to share for a while. You took a pack of crackers and a soda pop, while the other three took the candy and teas.
After about a few episodes of cartoons, it got a bit boring, so you decided to just be in your head a little bit while staring at the TV.
You tried to remember who your parents were, but only felt sad as you only remember them as a photo with their heads cut off. You whine at the thought, and your head started to hurt a lot. Nejire noticed, and so did the other two.
"What's wrong, (Y/N)-Chan?" Nejire asked, petting your head.
Suddenly, a tiny chainsaw sprouted from your forehead, surprising all of them as blood trickled down your face.
"Get Aizawa! Hurry!" She said to the two boys, who hurried towards the teacher's lounge.
Aizawa was grading the exams when Mirio and Tamaki came panting.
"Aizawa sensei, sorry to disturb you, but.." Mirio started.
"It's (y/n)." Tamaki finished with a worried look. Aizawa's eyes shifted, and he asked,
"What happened?"
Nejire was holding you in her lap as you laid on her chest, crying, and blood was still trickling down your face. Aizaw came calmly walking into the room, Nejire greeting him.
"Aizawa-sensei, I don't know what happened. Everything was fine."
"It's ok, Nejire." He reassured her, then crouched to your level and put a hand on your shoulder.
"You're ok, kiddo. You're at UA High School."
You were still sniffling, but the tears and shaking stopped. Aizawa gazed at the tiny chainsaw coming out of your skull, then tried to push it back in, holding the sides. It slowly disappeared back into your head, and the blood flow stopped. He took a napkin from his pocket and wiped your face clear of any blood.
"You good, kiddo?" He asked softly. You felt safe when he spoke to you, so you nodded, now very tired from crying. You made grabby hands towards Aizawa, wanting to be held by him. He carefully took you from Nejire, who looked skeptical. He nodded in reassurance to her that it was ok. She let go as you snuggled into Aizawa, wanting to hide. He rubbed your back and reassured you as he took you back with him to grade papers.
He had planned for you to try and train your quirk today, but plans changed as you had a panic attack and clearly didn't want to be alone or do anything else. He got back to his office and got out his yellow sleeping bag, setting it up for you to crawl into. You didn't hesitate and made yourself comfy. He zipped it up mostly, allowing for air to come in, and placed you nearby him so he could watch you.
You felt yourself calm down in the sleeping bag and soon fell asleep for the rest of the day.
He watched as you slowly fell asleep and sighed. Finishing up some paperwork, he decided to call it a day. He picked up any remaining paperwork, put it neatly away, and carefully picked you up to go home. He managed to slip by through the school undetected by students, and he's glad he didn't have to answer any weird questions.

Timeskip to getting home, he managed to get you to bed. He laid you gently on your bed and closed the door. He made you food in case you got hungry and put it in the fridge. He decided to leave you at home tomorrow with a babysitter, hopefully having a break from being overwhelmed at the school would help you. He smiled at the thought of you finally having a good time, with a big smile plastered on your face. He got out his paperwork and started to grade some papers to pass the time. He thought to himself as he imagined you smiling and happy,

"You're gonna be a good hero someday."