You were from a world called monster hunter and you were dragged through a portal to My hero. Due to how big you were you almost crushed someone when you landed in them by accident.

All of class 1-A was training in the gamma gym and Kirishima was being enthusiastic as ever when he partnered up with Bakugo. He and Bakugo were in a separated area of the gym. That’s when you arrived

Kirishima: “Let’s do this Baku-aahhhh!” gets landed on by you

Bakugo: “Kirishima!”