Hikigaya Hachiman gets transported to Lugnica instead of Natsuki Subaru. Naturally he wants to return to Japan.

The story of the not main character.

Who said you had to go and hunt all the Horcruxes?

The puberty of Hikigaya Hachiman is delayed by a bit to the end of middle school.

What if the knight of laughing tree was publicly captured for unintentionally mocking Aerys?

What if Armin had maintained his intelligence instead of losing it to Annie's crystal!