One of the Portrait Ghosts in Luigi's Mansion might be the Greenie ghost. It's often found lurking in certain rooms. These ghosts are spooky as they seem to be trapped in their portraits and then come to life in the mansion. They add an air of mystery and danger to Luigi's adventure.
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.
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.
Luigi is the central character in the Luigi's Mansion Dark Moon story. He is the one who is called upon to solve the mystery of the shattered Dark Moon. There are also Professor E. Gadd who provides Luigi with the tools like the Poltergust to help him in his quest. And of course, there are numerous ghosts which range from common ones to more menacing boss ghosts. These ghosts are the ones that Luigi has to capture in order to complete his mission.
One idea could be Luigi exploring a new, never - before - seen area of the mansion that has a different time - space distortion. In this area, the ghosts are more powerful and have unique abilities. Another could be Luigi teaming up with some friendly ghosts to fight against a powerful, evil ghost that is trying to take over the entire mansion and the surrounding area.
A talking portrait that gives Luigi hints and clues. It could be a former owner of the mansion who is now trapped in the form of a portrait. Another interesting character could be a ghost dog that befriends Luigi and helps him sniff out hidden items or ghosts.
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.