>>280197464 (OP)is it self-inserting if I imagine the scenario of what I'm reading in my head, but with no limit to alteration of it to suit my need?
For example, I read a manga about MC and his party full of girls, I could imagine this same set of cast doing something else entirely and not even fitting their personality at all, having entirely different special power, living in completely different world, with one of the girl just getting punched in the stomach and collapsing, puking, and crying