Yes, the 'Rising of the Shield Hero' novel is completed. It provided a conclusive resolution to the various story elements and character developments that were introduced throughout the series. Many readers were pleased with how it all came together in the end.
Common themes in such fanfictions may include intense emotional and physical relationships among the characters. It might focus on the chemistry between the Shield Hero and other characters like Filo or Melty. But these types of fanfictions are not always in line with the overall tone of the original anime or light novel. They tend to deviate into more mature content which may not be suitable for all audiences.
One idea could be exploring an alternate universe where the Shield Hero is from a different world entirely, with different cultural norms and magic systems. Another could be a story where the Shield Hero has to team up with his former enemies to face a greater threat. Maybe a fanfiction where the relationships between the heroes are explored in more depth, like the complex feelings between the Shield Hero and the Spear Hero.
Yes, it is. The story has an interesting premise with a unique take on the isekai genre. The protagonist is a shield hero who has to face various challenges and prejudices in a new world.
Sorry, I don't know off the top of my head. But you could try looking through online discussions or the official website of the novel for the correct chapter.