One idea could be that the Power Rangers are visiting Japan and accidentally stumble upon a villain attack in the MHA universe. They team up with the heroes from MHA. The Rangers could teach the MHA students some of their combat techniques, like the cool martial arts moves they use. And in return, the MHA students could show the Rangers how to use their quirks in creative ways during battles. It would be a great exchange of skills and a chance for some really epic fight scenes.
Definitely Deku and the Red Ranger. Deku is all about growth and determination, and the Red Ranger is often the leader and a symbol of courage. They could inspire each other in different ways. Deku could learn more about leading from the Red Ranger, and the Red Ranger could be inspired by Deku's never - give - up attitude towards getting stronger.
It's hard to pinpoint exactly where Gojo is at any given time in the manga. His whereabouts change as the story progresses and different scenarios unfold. It could be in a supernatural realm, a mission site, or interacting with other characters.