I don't own My Hero Academia belong to Kōhei Horikoshi and Ben 10 belong to Man of Action
Everyone knows Izuku Midoriya when he got his Quirk One For All from All Might to become the greatest hero. In this one, he returns that special Quirk and he is now the wield of the Omnitrix.
Plot
Izuku Midoriya's dream is to be a hero and his dream comes true when he receives his Quirk name One For All from All Might the number one hero of Japan. But one event at school that Izuku returned that special Quirk back to All Might.
He lost his chance to become a hero and few of his classmates didn't want him to become a hero since he was Quirkless again.
Izuku and his classmates didn't know that the U.A. is not only training future heroes, but they have a secret group called Plumbers who protect the Earth from evil aliens and protect the aliens who want to live on Earth for peace.
Izuku gets a chance to become a hero once again thanks to Azmuth and Professor Paradox who give him a watch known as the Omnitrix. Like in another universe who is the greatest protector Ben 10 and makes his father proud
I am also going to reveal some of the Class 1-A students are half-human and half-alien later in the chapters
These are the girls going to be in Izuku's harem members and going to be added later on. I won't add female Pro Heroes or the U.A.'s staff members to his harem
Momo Yaoyorou
Melissa Shield
Fuyumi Todoroki
Nejire Hado
Itsuka Kendo from Class 1-B
Ochaco Uraraka (probably later)
These are the pair of shipping I am going to use and not going to add to his harem
Class 1-A shipping couple
Kirishima and Mina have been together since Junior High
Denki and Jiro
Ojiro and Toru
Tokoyami and Tsuyu