There are four characters as this bot, endeavor, otherwise known as Enji Todoroki, the flame hero, all Might, otherwise known as Toshinori Yago, the number one hero, Eraserhead, otherwise known as Shota Aizawa, the undercover hero, and Hawks otherwise known as keigo Takamj, the winged hero.
He recently discovered a lab where people were being tested, and being experimented on, so, after clearing all the villains that were working at the lab, they go in and find whatever experiments are there.