When Obito is killed by Kuguya's attack he though he would wake up in heaven or hell..not his old bedroom from when he was 13 years old, in his 13 year old body (Eventual Obirin) AU Time travel

Shoto Todoroki was fighting along with his father when he was pushed out of the way of an attack, which lead him to fall into a portal to the world of Demons and Demon Slayers. Todoroki first met the Flame Hashira, who rescued him the night he arrived in the new world. Since he was always about helping people in need, he decided to start training to become a Demon Slayer. I don't own Demon Slayer or My Hero Academia, I only claim the storyline used in this book. Best Rankings: #1 - giyutomioka #1 - tanjirokamado #1 - kochoshinobu #1 - crossover #2 - kyojurorengoku #3 - hashira #3 - shototodoroki

"In the hero world, those who break the rules are scum, that's true. But those who abandon their friends are worse than scum." Scum is on the streets, and I must clear it.

I love all that fanart about RBA Whirl being IDW Whirl's daughter (cover work in not mine), so I thought he should visit the academy to teach the recruits about functionists. WARNING: human racism is also discussed.

Instead of Kamado Tanjiro being the eldest son, Tsugikuni Yoriichi (Now reincarnated into the Kamado family) is the eldest? What if only Yoriichi and Tanjiro were the only ones left alive after Muzan kills their family? ❕This story is an AU❕but expect some off the scenes to be based of the Original Manga/Anime (THAT I DON'T OWN!) No pairings/romance will be done here. I think sometimes that it holds back the story. Constructive Criticism welcome! Tell me if something is wrong or my spelling mistakes decide to be REALLY BAD. Once again: I don't own KNY/ Demon Slayer at all! The Original Story is NOT owned in any way, shape or form. (I post whenever I can)

Izuku Midoriya was thrown into the river by his mother so he couldn't suffer the same fate as his parents. He spends the next 12 years growing up with boars and strengthening his body. Deku becomes the self proclaimed mountain king and when strangers enter his territory he will find a way back into society and enter UA. And with the help with old friend Bakugou and new friend Ochaco, he will remember his past life.

When Izuku Yagi went to school that day, he never knew how his world would change, he never would have guessed that he would become the vessel of Sukuna and finally escape his horrible past life. Will Izuku become a hero? Will he surpass his mentor Gojo Satoru? Will he gain the support and trust of Sukuna and become the greatest hero? *Warning* contains jujutsu Kaiser manga spoilers

Izuku spent his childhood learning Thunder Breathing. It was a technique used to slay demons. Demons were long forgotten as quirks rolled in, demons faded out of existance. Or so it was thought. Muzan, who was surprisingly alive even after thought to be killed appeared infront of Izuku in a dying state. Muzan offered Izuku strength at the cost of the inability to be in the sun. If strength meant he could save people, then Izuku was all for it. He already had a Demon Slayer mark, so his appearance was odd already, mix that in with his 4 new eyes and you get an even stranger look. Not that anyone would care, he live in the age where mutations were normal-ish. Oh, he also had markings covering his body with mouths on his limbs (I will draw another pic of his lower body) Being a Demon meant that he possed a Blood Demon Art. Cresent Moon Blades was the name of his Blood Demon Art.

Neglected Izuku Yagi AU Izuku Yagi, brother of Izumi Yagi, son of Toshinori Yagi (All Might) and Inko Midoriya (Mindwave). Izumi had a stronger version of her mother's quirk while Izuku was quirk less and was then neglected for most of his life. He soon decided that he had had enough and started a new life, with a family of spider demons. This has partial ideas from other fanfics that I have read. The only part of Demon Slayer that is in this fanfic is the spider demon family from the Mount Natagumo.

Izuku Midoriya had always been a curious child, spending hours researching the fascination of his world. Quirks. He believed that quirks must have been a blessing of some kind and was excited to find out what his was, until it manifested and his life happy little life was uprooted.