What are some interesting plot ideas for 'rising shield hero crossover fanfic'?

A crossover with 'Overlord' could be really exciting. The Shield Hero could come across the powerful beings from Nazarick. There could be a conflict at first due to misunderstandings, but then they realize they can work together. The Shield Hero could use his strategic skills along with the power of the Overlord's minions to face a common enemy that is a threat to both their existences.

Well, you could write a fanfic where the Shield Hero gets transported to a different part of the world that has a completely different culture and set of rules. This would force him to adapt in new ways. You could also do a story where he teams up with an unexpected ally, someone who was initially his enemy. Maybe a character from the antagonist side realizes that they have a common goal and decides to join forces with the Shield Hero. And don't forget about a time - travel fanfic, where the Shield Hero goes back in time to change certain events that happened to him at the start.

One idea could be exploring an alternate timeline where the Shield Hero starts with different abilities. For example, instead of just the basic shield, he has a shield with hidden offensive powers.

One idea could be exploring an alternate universe where the Shield Hero is initially welcomed in all the kingdoms. He could form alliances more easily and face different types of enemies. For example, instead of just fighting waves of monsters, he has to deal with political intrigue from other heroes who are jealous of his new - found popularity.

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.

One idea could be that the Dark Lord has a hidden past that is somehow related to the Shield Hero. Maybe they were once allies in a different realm before being corrupted. Another could be that the Dark Lord is actually trying to protect the world in his own twisted way and the Shield Hero has to figure out his true motives.

One idea could be focusing on the reactions of the side characters to the Shield Hero's actions. For example, how the merchants in the town react when he starts to gain more power and influence. Another could be the reaction of the other heroes when they realize the Shield Hero's true strength and capabilities.

Another plot could involve the heroes from Fate Stay Night being transported to the world of the Shield Hero. They then have to adapt to the different rules of that world, like the wave system. For example, Saber could try to fight the waves using her Excalibur, but find that it's not as effective as she thought due to the different magic systems.

You could include characters like Naruto. His ninja skills and the Shield Hero's combat style would create an interesting dynamic. Also, characters from One Piece such as Luffy. Their different leadership styles and goals would be fascinating to explore in a crossover. Another suitable character could be Harry Potter. The magic in the Harry Potter universe and the Shield Hero's abilities could interact in unique ways.

Perhaps there could be a time - travel related plot. A device is accidentally activated in a S.H.I.E.L.D. lab that sends some Agents and Avengers back in time. They end up in a crucial moment in history, like during World War II. There, they meet younger versions of some of the Avengers. They have to work together without changing the timeline too much while also finding a way back to their own time.