Disclaimer I do not own the rights to any Mario characters or My Hero Academia characters. This story takes place after the adventures of Mario and Luigi in the One Piece Universe. Thank you and enjoy.

Prequel

At the testing grounds for the UA entrance exams

Izuku Midoriya was in a panic, the exams were nearly over, he hadn't scored a single point and a giant zero point robot had just appeared. He was about to run with the rest of the examinees when he heard a young girl. It was the girl from earlier that had saved him from falling on his face and she was about to get crushed by the robot. Midoriya was about to launch at the robot when a giant hole in the sky opened and five bright lights came out scattering across Japan. And one was heading straight to Izuku, he put up his arms to defend himself. But, when the item hit him he only felt a light tap. Confused he opened up his eyes and saw a bright yellow star with eyes. He picked it up confused on what this was.

Suddenly the robot began to move again and Izuku was about to save the girl when the sky opened up again. But, this time three figures came out of it.

"MAMAMIA!" Two of the figures, a mustached man in red clothes and overalls and another mustached man with green clothes and overalls, yelled as they were falling to the ground. The third figure, a blonde female with a crown and pink dress, slowly floated to the ground. As they were approaching the ground, the zero point robot noticed them and tried to attack them.

"Luigi!" The red figure called out.

"Got it Mario!" The green figure answered back. With that, they corrected their trajectory and dodged the robots attacks. Mario then proceeded to stomp on the robots left arm and destroy it. Luigi then stomped on the robots other arm and destroyed it. Then the brothers came together with Luigi grabbing onto Mario's ankles and they did a corkscrew attack on the robots head destroying it as well. When they landed Mario grabbed the robot and swung it around before launching it into the sky.

"So long you big hunk of junk. I wonder if this is how Sonic feels?" Mario said, before looking around. "Princess? Where is Peach?" Mario asked as he and Luigi began to look for her.

"Up here you two." Peach said as she slowly floated to the ground. Mario and Luigi held out there hands to guide her down. While they did that the examinees just stared at them with awe and terror. Who were these people and how did they destroy a zero point robot with such ease.

Yes the Mario Bros and Princess Peach have arrived in the My Hero Academia universe. What changes will there arrival bring? Who will find the power stars first and what miraculous or disastrous feats will they do with them? Only time will tell.

So I decided to release this prequel chapter to show where I also want to take this story. The reason why I'm releasing this before finishing the One Piece crossover is because the One Piece Crossover will be long. I plan for that to go all the way to Marineford, but I was thinking of maybe releasing these chapters alongside the One Piece Crossover since I have so many ideas on how Mario, Luigi and Peach would affect the story of My Hero Academia. Thoughts and opinions would be appreciated, thank you.