Well, in a fanfiction, the Hex Girls might be trying to unlock an ancient musical power. They believe it's hidden in an old, abandoned theater. Scooby Doo and his friends join them on this quest. However, the theater is full of traps and ghosts. As they explore, they learn that the ghosts are actually the guardians of the power. The Hex Girls must prove their worthiness through their music, and with Scooby Doo's help in distracting the ghosts, they are able to unlock the power and become even more amazing musicians.
One possible fanfiction could be about Scooby Doo and the gang encountering the Hex Girls during a music festival in a spooky forest. The Hex Girls' music has some strange effects on the forest creatures, and Scooby and Shaggy are both scared and intrigued. They have to work together to figure out if there's something truly supernatural going on or if it's just a really cool music trick.
A possible plot could be that a new ghoul girl arrives at the school and she seems to be causing strange things to happen. The Scooby Doo girls suspect she's up to no good. But as they get to know her, they find out she's actually being controlled by an evil force. They then have to find a way to break the control and save their new friend.
Well, perhaps the plot involves a female Shaggy who has a special connection to one of the villains. Maybe she knew the villain from her past and this knowledge helps the gang understand the motives behind the spooky happenings. She could also use her charm and wits to get closer to the truth than the others in the group. As the story progresses, her relationship with the other characters, like Fred, Velma, and Daphne, might evolve in interesting ways as they all work together to solve the mystery.
In this fanfiction, it could start with Scooby Doo and Shaggy being chased by a 'monster' which turns out to be a large, misunderstood Pokemon. The Pokemon trainers then come in to help calm the Pokemon. As they get to know each other, they find out that there is a mystery surrounding a series of disappearances in the area. The combined skills of the Pokemon's powers and the Scooby gang's sleuthing lead them to a hidden lair where a mad scientist is trying to use Pokemon DNA to create an army of super - monsters. They must work together to stop this evil plan.
Well, it could be that the Naruto gang gets transported to the Scooby Doo world. Maybe they team up to solve a mystery that involves some sort of ninja - like villain in the Scooby Doo town. Naruto could use his shadow clone jutsu to help search for clues while Scooby and Shaggy are off running from the 'ghost' that's really the bad guy in disguise.
Perhaps in a fanfiction, the gang could be exploring an old haunted mansion. Velma discovers some strange clues that seem to be related to a long - lost love story. As she and Daphne research more deeply, they start to feel a strange attraction towards each other. Eventually, as they solve the mystery of the mansion, they share a kiss, which is a celebration of their new relationship as well as the solving of the mystery. It could also add a layer of complexity as they wonder how the rest of the gang, especially Fred and Shaggy, will react.
One possible plot could be that the Nirvana members are somehow trapped in a haunted place. The Scooby Doo gang hears about it and decides to help. As they explore the spooky location, they discover that the haunting might be related to an old grunge - era feud or some dark secret from Nirvana's past. They use their usual sleuthing skills along with the music and vibes of Nirvana to solve the mystery.
Well, one idea could be that the Mystery Inc. gang gets transported to the Fairy Tail world. They team up with Natsu and his friends to solve a mystery involving a powerful and evil magic that's causing chaos in both worlds. Maybe the villain is using some kind of ancient spell that creates spooky illusions, which is right up Scooby Doo's alley.
A great plot could be that there's a food - themed mystery. A new, strange food is making people act weird in town. Scooby Doo and Shaggy are, of course, very interested in the food aspect. Tom and Jerry are also drawn to it because it smells so good. Tom wants to keep Jerry away from it, but they all get caught up in finding out where the food is coming from and why it has such an odd effect. The gang uses their detective skills, while Tom and Jerry's constant chasing around the food sources actually uncovers some hidden secrets about the mystery food.
Well, perhaps the Scooby Doo gang could time - travel to the era when Jurassic Park was being built. They start to notice strange things happening, like the dinosaurs seem to be more intelligent than they should be. It turns out that a disgruntled employee is using some kind of new technology to control the dinosaurs and make them cause trouble. The gang has to work together, with Scooby and Shaggy providing some comical relief as they are chased by T - rexes and Velma and Fred solving the mystery.