The many heroes(Mei x male reader) (Mha x Ben 10)

Heroes vs Villains

The past few days have been tough on class 1A. From Mr Aizawa's lessons on basic hero law to Present Mic's boisterous english class and the insanely hard maths class of Ectoplasm which may just be due to maths being my weak point. The only class that was relatively easy for the students was hero history with Midnight as prior to coming to Ua it would expected of students to read up on heroes who may possibly have similar quirks to them or have good tactics in battle that students may use in their upcoming professions. And with the fact that Y/n lived with Miruko for most of his life and how the kid currently bottom of his class, Midoriya, seemed to know more about heroes then even Todoroki who grew up near heroes, him and Y/n were the top of the class.
Today was like any other school day which started with the boring but important hero laws then english, maths and lunch. Right now would be the class's last lesson. The students sat in their homeroom and many of them started conversations with other students about who they thought their teacher would be. If this was any other class, the teacher would already be inside the classroom and they wouldn't be given the chance to converse with other. But this class was different. Right now would be their first hero training class which spawned the topic of who their teacher would be.
Momo:So Y/n who do you think will teach us today? I think it may be someone like Death Arms or Gun head.
Y/n:I don't know. This may be biased but I kind want it to be my mom.
Jiro:I mean, she is a badass fighter but I highly doubt a hero in the top 10 would be teach-
She didn't finish her sentence as the class hears loud, thunderous footsteps.

The class are astonished to see the number 1 hero when he sees somebody he recognized.
All might:Hello students! As most of you should now by now I am of course a teacher at UA high school! And today I will be teaching you your first lesson in becoming heroes. But how can you be heroes without looking like a hero?
He presses a button as briefcases pop out. They each grab one corresponding to their seat number with Y/n getting a suitcase that says 10 on it. They go their respective changing rooms and after about 5 minutes they come out. Y/n is wearing a green cropped blazer with a black tracksuit. He wore silver gauntlet like gloves that had green finger tips. On his left hand which held the Omnitrix the glove had a cover that could slide in and out for easy access. He had steel plated kneecaps for protection on his knees and he wore green goggles that were also equipped with x ray vision Thermal tracking and GPS.

All might:Wow! You all look like true heroes! So time to explain the exercise. We will be playing heroes vs villains. One team the villains will be placing a fake bomb on any one of the floors. The heroes must try to either subdue both if the villains with tape or at least one of them must touch the fake weapon in order to 'disarm it'. And these pairs will be sorted out by slots!
He gets two boxes and pulls out multiple names to pair them with each other to get the following teams:
Izuku Midoriya & Ochaco Uraraka (Team A) vs. Katsuki Bakugo & Tenya Ida (Team D)
Shoto Todoroki & Mezo Shoji (Team B) vs. Y/n Usagiyama & Toru Hagakure (Team I)
Fumikage Tokoyami & Tsuyu Asui (Team H) vs. Eijiro Kirishima & Hanta Sero (Team J)
Denki Kaminari & Kyoka Jiro (Team G) vs. Momo Yaoyorozu & Minoru Mineta (Team C)
Yuga Aoyama & Mina Ashido(Team E) vs. Rikido Sato & Koji Koda (Team F)

Todoroki seemed to be fired up both literally and figuratively to battle Y/n. This would be the start of him crushing him with his ice. The first match was Team A vs Team D

It was now time for the second match between Team B and Team I. The villain team were given 5 minutes to set up their bomb and their trap. The building had a total of 10 floors. Y/n stood guard as the 5th floor while Hagakure placed the bomb on the 7th. Once their time was up Todoroki and Shoji entered the building. Todoroki originally planned on just freezing the building but this grudge he as against Y/n made him want to face him head on. The pair made it to the 5 the floor where Y/n was.
Todoroki:Shoji, go up and find the bomb.
Shoji:Alright.
He ran past Y/n as the Omnitrix wielder smirked at the half and half hero.
Y/n:You think you can take me on without help?
Todoroki:Yeah, so hurry up and transform.
Y/n:If you want to get destroyed by my transformations then I choose Four arms.
He pressed the Omnitrix as he was consumed in a green light. However, instead of the four arms brute in his arsenal he became an insect like being with no visible eyes and the Omnitrix in the centre of his face.

Y/n:Stinkfly?!
Todoroki held his nose due to the stench but he was furious.
Todoroki:Are you making fun of me?!
In rage, Todoroki punched the ground as a surge of ice covered the room. Stinkfly managed to fly out of the way of the attack. The bug then shot at the boy as Todoroki tucked and rolled out of the way. The slime is stuck on the ice walls as Stinkfly flies in pursuit of Todoroki. More ice walls are formed until the room becomes a maze of ice and slime. Eventually, Y/n trapped Todoroki in a cocoon of slime. The bug then lands in front of Todoroki and snickered.
Stinkfly:Gotcha hero! Even my weakest transformation can best you.
Todoroki:Grrr, shut up!
He is getting more frustrated as his left side flares up.
Stinkfly:Todoroki wait!
It was too late as Todoroki's anger set the slime on fire. The green liquid combusts into a giant explosion that shakes the building. Everyone is worried until the smoke clears. The explosion knocked out Todoroki but Y/n had become a giant ball. The ball uncurled to reveal a large white creature

Y/n used this opportunity to capture Todoroki. The villains win as the explosion knocked Shoji off balance and Hagakure was able to capture him.