A world where the demons were not eradicated at the final battle. The evolution of quirks instead was replaced by the universal training of breathing techniques. It was every kids dream to be a demon slayer then a hashira. Follow Izuku Yagi as he becomes the one to finally end the demons.

Izuku Kamado formerly known as Izuku Yagi has been quirkless for most of his life, his life was far from peaceful as he had to work hard to gain the acceptance of the society but it was to no use but when a guiding hand come right to him he will hold on to it and become a demon slayer.

An Izuku Yagi story. During his Preschool days, he was ignored for being, as what society refers to as 'Quirkless'. All but 5 ignored him. They bullied him instead. Those were his sister, and his other childhood 'friends', the Bakugo and Todoroki twins. The girls only did it because they thought it will 'protect' Izuku from becoming a hero. The boys, however, had ulterior motives. During Grade School, he met the rest of future Class 1A. They found out he was Quirkless. The boys didn't like him already, but the girls, they didn't mind it at all. They actually found him as someone they should protect. They knew of his dream to becoming a hero, but they didn't want him to be one because of how dangerous the work can be. The boys found out, and they got mad. They persuaded the girls into bullying him, and to stop him from becoming a hero, and they eventually joined in, but only 3 weren't brought to the bullying. Those being Momo Yaoyorozu, Kyoka Jiro, and Ochaco Uraraka. Find out more in the story. Just to point some stuff out: - Kamaboko Squad members are all Demons because of a bad past. - Some characters that are supposed to be dead are alive. - Way more than 12 demon moons. - Canon Pillars, plus Kanae, of Demon Slayer Corps are Moons. - Pillars of current Demon Slayer Corps will be OC characters. - Izuku will have a harem... again

This story will follow the what-if question of what if Izuku was actually the son of Hisashi Midoriya aka All For One who disappeared after his fight where he 'died' to All Might aka Toshinori Yagi who ended up meeting a woman called Inko Midoriya whose husband disappeared. What if All Might married Inko Midoriya and had another child within the same year of Izuku who was about a full year older than Izumi Yagi the daughter of All Might and Inko Midoriya. What if Izuku had a quirk but it had activated at birth so Hisashi took it to ensure his son wouldn't hurt himself. What if that quirk was All For One as well but a more advanced version? What if Izuku tired of being neglected by his mother and his step-father who he saw as a father and was tired of being bullied by his younger sister and her friends Katsuki Bakugo and Shoto Todoroki? What if Izuku runs away and runs into Hisashi Midoriya who takes him to America where he becomes a full-fledged hero at a young age due to Hisashi connections. What if one-day Izuku returns to America and faces his past once again? Well, find out with us as we follow the story of Izuku Midoriya the Shadow Hero!

Izuku Yagi lived a happy life along with his sister Izumi Yagi and his friends the Todoroki's twins (Shoto and Shoko) and the Bakugo's twins ( Katsuki and Katsumi). Until one day, the day of his 4th birthday, he was diagnosticed quirkless. All of his dreams were crushed thanks to one word. But little did he know that yes he didn't have a quirk but something greater than that Disclaimer: I do not own my hero academia or demon slayer

Izuku was a average 4 year old boy always dreaming of becoming a great hero like his grandma was and older brother is. On the day he goes to see what his quirk is everything changed for how powerful it will be for he has the powers of the phoenix.

A quirkless boy becomes the successor to some of the most powerful beings in the world, in order to become the world's next symbol of peace. Will the boy succeed in his dream? who knows honestly. but this is his story.

Life is unfair to izuku yagi who was a happy ordinary kid having loving parents and sister and friends wanting to become hero like his idols All might and Green magneta but the when he become 4 and discover that he was quirkless and he's life changed to nightmare but he stele want to become hero but life had other had other plan for him When he discover that All might is Toshinori yagi and hearing what he think about him....that was last straw his idols or parent's neglecting him his sister and 'friends ' using him as punchig bag all that and he stele believed his idol but now he just want to all of the pain....

Izuku gets an improved version of AFO after he learns that he's the son of AFO at the age of 10. He was announced quirkless at the age of 4 and since then his step-father and mother neglect him. Additionally, his older sister and her group of friends: Katsuki and Katsumi Bakugou, and Shoto and Shoka Todoroki, all bully him with their quirks and scar his entire body. So he runs away to America to train for 6 years and become as strong as possible. After he returns to Japan, he attends UA to accomplish his dream of becoming a hero. While there, he makes many friends and learns many things, and he becomes as strong as possible to stop his father and to save his loved ones.

Hello and welcome to What if Izuku Midoriya found the Omnitrix, this is a what if series where I combine 2 of my favorite shows, Ben 10 and My Hero Academia. I really like the Idea of Midoriya having the omnitrix and have been slowly meshing in other elements from the Ben 10 timeline.