List of Protags

The multiverse. An infinite structure that contain an equally infinite amount of worlds in them, in some of these worlds however, there are some men and women (mostly from Japan) that due to some events, either their death or whim of some goddess or a very effective truck, they end up in another world where they live out a new life.

While there's been cases of some of these men and women interacting with one another, what would happen if they were to witness the adventures they lived while in another world?