(The time when he gets sent back is after he mastered his powers)

Drake: Oh and before we start, Enji, this will be a bit shocking to you.

Endeavour: Why?

Drake: You'll see.

The screen turns on and we can see Y/N sitting in his living room scrolling through his phone when Drake appeared out of nowhere.

Y/N: *startled* Oh fuck. The fuck you want this time?

Drake: You're going to the past because I'm bored so goodbye. *snaps fingers*

Y/N: *poof*

The scene changes to the hospital when Y/N wakes up.

Y/N: *groan* Mother fucker. Now where the fuck am I?

???: In the medical wing in my school.

He turns to the sound of the voice and sees a BIG man sitting in a chair smiling at him.

Biscuit: My name is Biscuit Oliva and welcome to my hero school UA.

Gran torino: *shivers* 'Oh God not him'

Nezu: *smiles* 'sensei' *sips tea*

Biscuit: Now tell me, why were you laying unconscious in the backyard of UA?

Y/N: It'll be hard to believe but I came from the future. My friend who is a god got bored and he decided to sent me into the past.

Biscuit: I believe you.

Y/N: I knew you wouldn't- wait what?!

Biscuit: I said I believe you. I witnessed many strange shit in my life so this is nothing new.

Y/N: Oh. What now?

Biscuit: *shrugs shoulders* Want to teach at UA?

Y/N: Wait what?

Biscuit: I'm a bit short on teachers and there's a class who are total bitches except one student and I need someone to teach them.

Y/N: *inner Nezu awakens* OHOHO now you're talking on my language, let's do it.

Biscuit: Splendid. Let's go to my office. I'll give you the files of the class.

Union(-Nezu): *looks at Nezu*

Nezu: What?

Aizawa: What do you mean what? Why do I feel like you taught Y/N some things.

Nezu: Because I did. If you can have favorites then so can I. *sips tea*

-in the office-

Biscuit: *sips tea* So what do you think of them?

Y/N: *looking through the files* Yea you were right when you said that they were total bitches. *sips tea* But at the same time this student intrigues me, the file says "doesn't gives shit what others think about her methods, if it gets the job done she'll do it". Interesting.

Biscuit: Ah yes, her. She's a top student. And she's going to be a great hero.

Y/N: *puts files down* Agreed. *sips tea and then snaps his fingers* Now I remember you. Principal Nezu told me stories about you.

Biscuit: Principal? So the crazy rat-god took my place after all.

Nezu: From this day forward you all refer to me as rat-god!

Union: *sigh* Yes rat-god.

Y/N: Yea, he also told me that you give deadly hugs.

Gran torino: He just doomed himself.

Izuku: Why?

Nezu: Because as he said Biscuit gives deadly hugs.

Gran torino: Why do you think my back always hurts. He did this to me.

Nezu: Your fault that you're almost always late.

Biscuit: *grins* That I do. Want to feel one?

Y/N: Why not.

Gran torino: 'may his back rest in piece'

They stood in front of each other and biscuit got ready to hug Y/N.

Biscuit: *in mind*

Biscuit: Feel the mighty hug!

He then hugs Y/N very tightly and you could hear a few cracks.

Y/N: Holy shit he wasn't kidding. But it's not that painful, and hey, I think you fixed my back.

Biscuit: *surprised* You're Ok?

Y/N: Yup. Now I'm next.

Y/N then hugs Biscuit with a bit of his power and you could hear cracks as well but a bit more then a few.

Y/N: *lets go* How was that.

Biscuit: *cough* Damn, is that what my hugs feel like? They hurt a bit.

Y/N: Yea, I'm going to class now, I have kids to teach.

Biscuit: You do that. Also say hello to Nezu and Gran torino when you go back to future if he's still alive.

Y/N: Ok. *leaves the office*

Gran torino: When you told me and I quote "Biscuit says hi and asks how's your back" I thought that it was a prank.

Y/N: Hahaha, say thank you that you're old now because if you weren't I would remind you how his hugs feel like.

Gran torino paled at that statement and Nezu laughed.

The scene changes at where Y/N was standing in front of the huge doors and 1-B was written on it.

Y/N: So that's why they make doors that big. It's for someone like Biscuit. Now then.

He walked in and all of the students looked at him. He walked over to the teachers desk and wrote his name on the board and turned to class.

Y/N: Hello class 1-B, I'm your temporary teacher Y/N Anderson.

???: YOU THINK YOU'RE BETTER THAN ME YOU EXTRA?! HUH?!!

Everyone looked at Bakugou.

Shigaraki: So that's who you got your attitude from.

Bakugou: WHAT'S THAT SUPPOSED TO MEAN.

Dabi: Exactly what it sounds like.

Y/N: I'll assume you're Masuru Bakugou.

Masuru: SO WHAT?!

Y/N: Nothing really. But I wouldn't describe you as human.

Nana: Then what is he?

All Might: Master.

Izuku: '7th!?'

Y/N: Well I would describe him as and I quote "a retarded twat with his head so far up his ass that his spine impaled his brain and killed off his last remaining ounce of common sense".

There was a minute of silence and both the class and the audience broke into a hysterical laughter except Katsuki and Masuru who were fuming with anger.

Y/N: Now now class calm down. Now please Teka Todoroki, raise your hand. (But in the UA uniform and ignore the girl)

Endeavour: MOM!?

Everyone(-Y/N): MOM?!

Y/N: Wait for it!

Y/N: Please stand up and leave the classroom.

Teka: May I ask why?

Y/N: Because from what I read from the files you're the only one in this class who isn't a total weak bitch. Now you can feel free to leave, you're a top student and you don't have to worry about the grades.

Teka: Ok? Thanks I guess.

She got up and left the classroom.

Y/N: Now then, as my favorite teacher once said. *puts hand into the pocket* Time to beat bitchassness out of you.

Aizawa: *sheds tear* I'm proud.

-meanwhile outside the classroom-

Teka: I wonder what he'll do to them. Wait what is that? *stops and listens*

Y/N: *in the classroom* LIFE GRENADE!

1-B: *terrified scream*

Teka: I like him. *starts walking away* I wonder if he's single.

Endeavour: WHAT!? *faints*

Todoroki: I wouldn't mind having you as a grandpa.

Y/N: Awww, thank you Shoto.

The scene then changes to Y/N standing on the beach shadow boxing when he heard someone approach him so he turned around and saw someone he couldn't believe. In front of him stood Yujiro and Baki Hanma, the #1 & #2 strongest creatures on earth. (Once again, yes, yes I did. Yujiro good father AU)

Zeoticus: Oh Satan. *shivers* I remember when I met Yujiro.

Rias: Is he that strong?

Ophis: Yes child.

Everyone: SINCE WHEN WERE YOU HERE?!

Ophis: Since the start. Now I'll say, I met Yujiro and his son myself and-

Everyone: And?

Ophis: -I got my ass handed to me. They were too strong.

Everyone paled except a few people, (you probably know who) if the dragon God lost to them then how strong are they?

Y/N: Oh? And what does 2 strongest creatures want from little old me?

Baki: You know us? Surprising considering a small percentage of people remember us.

Y/N: I'm from the future. I'm a fan of you honestly, that's why I strive to become strong.

Yujiro: And that's why we're here. I feel that you're holding back your strength and I want to test you.

Y/N: And why is that?

Yujiro: We want to pass our teachings to someone but everyone weren't strong to handle them.

Baki: But when we felt your energy we knew that you're strong enough. But we'll have to test that first.

Yujiro: Get ready. I want to see if you'll be able to withdraw a 50% punch from me.

Y/N: You know what, I'll humor you. Do it.

Yujiro didn't wait and threw a direct punch into Y/Ns chest. Y/N stood straight without blocking and when the punch hit him he just skid back a few meters but stood the ground.

Yujiro: Impressive.

Y/N: Thank you. It hurt a little, and I must say that's one hell of a punch. But was that 50% or 75%? Because I'd say it was 75%.

Yujiro: Smart. You're right that was 75%. Now then, let-

Baki: -the training-

Yujiro/Baki: BEGIN!

And with that the screen turned off.

Y/N: What can I say, the training paid off. You know I might bring you with me when I'll be visiting them in the afterlife Rose.

Rose: Really?

Y/N: Yes. I'll ask them to teach you how to protect yourself, but I'll also ask them to go easy on you.

Everyone literally were shaken by the thought of Rose being trained by Yujiro and Baki.

Drake: Now that that's out of the way. Onto the next one we go.