Some characters would be excited. Imagine if Goku from Dragon Ball saw a fanfic where he had new and even more powerful forms. He'd probably be thrilled to see the creativity of the fans and might even get inspired to train harder in his own world, thinking about all the cool possibilities the fanfic presented.
The best way could be to have previously saved the snaps you want to watch again. If not, it's quite tricky as Snapchat doesn't have a built-in way to retrieve disappeared stories easily.
Sometimes it does. It can vary based on your account preferences and the specific features you have enabled or disabled. Also, different versions of the app might handle notifications differently.
Generally, Snap doesn't send notifications when you take a screenshot of a story. However, it's always good to stay updated on their terms of service as they might introduce such a feature in the future.