It could be that you haven't fulfilled all the necessary conditions or triggered a hidden requirement to continue the story. Check for any side quests or objectives you might have missed.
One popular 'king boo x luigi fanfiction' might be those that explore an unlikely friendship between them. For example, a story could start with Luigi accidentally stumbling upon King Boo in a non - threatening situation, and they gradually learn to understand each other.
Another way their relationship develops is through a mutual respect for each other's abilities. Luigi is known for his bravery in the face of the spooky, and King Boo has his own power and influence in the ghost world. So, a story could show how they come to respect these qualities in one another over time. This could lead to a more complex relationship where they are not just enemies or friends, but something in between.
One of the top stories could be the encounter with the various bosses on different floors. Each boss has its unique design and backstory, like the sea - themed boss on one of the lower floors. Another top story might be Luigi's exploration of the different themed floors, such as the spooky circus floor.
For a Luigi's Mansion and Super Smash Bros. crossover fanfiction, Luigi could be in the middle of a Smash Bros. battle when a portal to his mansion opens up. Characters from the Smash Bros. roster get accidentally sucked in. Luigi has to lead them through his mansion, fighting off the more dangerous ghosts. Some characters like Kirby might try to eat the ghosts, while others like Link would use their weapons. Along the journey, they discover secrets about Luigi's Mansion that Luigi himself didn't know, all while trying to find a way back to the Smash Bros. arena.
Maybe the mansion is a place where time and space are distorted. Luigi and Tails get separated at first. Luigi has to find Tails while dealing with the strange things in the mansion like rooms that change shape. Tails, on the other hand, is trying to find a way to stabilize the time - space distortion. Eventually, they find each other and combine their efforts to fix the situation.
Luigi's Mansion 3 story doesn't offer online coop. It's designed for local cooperative play, which means you need to have another person physically with you to play together.
One idea could be exploring Luigi's character growth. Maybe he discovers a new power within the mansion that helps him face his fears more bravely. Another idea is to create a backstory for the ghosts in the mansion, like how they came to be there and what their lives were like before. A third idea could be a crossover where characters from another game enter Luigi's Mansion, creating new and exciting adventures.
The story is about Luigi being called to investigate a series of hauntings at Evershade Valley. He uses his Poltergust to capture ghosts and solve the mysteries. There are different mansions with their own unique challenges and ghost types. Luigi has to face all these spooky situations to restore peace in the valley.