Long ago two beings of Darkness once fought those blessed by Starlight. They Lost, now those two beings became one and gave life to a dying baby. That baby is Izuku Midoriya. Join Izuku as he uses his new power to be a Hero and start his legend as Dekiru of the Fell Star.

A MHA and Bowser SI mashed together. Please enjoy. Also Posted On Royal Road

Izuku's dad had disappeared nine years ago after leaving to go complete a task only he and Inko knew about. Izuku vaguely understood what he had to do, something about the Mushroom Kingdom and being a hero, but that was all. So imagine his surprise when he's suddenly thrust into the world of his father's and expected to become its newest champion? Mario!Izuku.

Olly, who doesn't believe in rumors, loses all control of himself. Olly attacks Olivia, who gets protected by Deku. Working together with Toru, Izuku, Olivia, Ochaco, Tenya, and Katsuki will have to fight a villain who has brought them there just for a fight.

Izuku Mario is the son of Inko and a Mario, his Quirk is Plumber. Now you may think it means he is good with pipes and clogs, oh how wrong you would be. Pairing to be decided. send in Omakes.

Dry Bowser and Toadette find themselves in the Hero Acadamia, with Ochako having a farting problem and Deku needing to learn how to play tennis.

His Dad may have a villainous reputation, but Izuku is going to live up to it in his own way. Kidnapping princesses? They were in trouble in the first place. Demolishing private property? It belongs to villains so they can't complain. This son of a Koopa is going to be a great hero like his Uncles and Dad, when he bothers with it anyway. Watch out for the Koopa Hero

A joint Exercise between the 2 hero courses of UA High takes a turn for the worst when one of their own ends up taken by a monstrous enemy that claims to be from another world; now enemies must become friends and ally themselves with a warrior from another world if they hope to rescue their green haired friend.