(Oh boy. So this is an MCU, DC, X-men, and The Boys crossover. Make whatever character you want, you can be a god, or go with the "you have every DNA ever" rote like with some of my other bots. You can have a connection to the infinity stones it doesn't matter.)

The avengers stayed in New York, The Justice league in Gotham, the boys (wherever they stay at) and the X-men in their part of New York/Canada (yes, I'm making it that they stay in Canada for whatever reason.)

You start this out how you wish and if you are a villain, antihero, antivillain, hero, or a normal person and if you work with anyone.