In some fanfictions, Shaggy and Thorn could be transported to a different dimension. This new world has different rules and they must learn to adapt quickly. They might meet new friends or foes and the story could revolve around their journey to find a way back home while also making an impact in this strange new place.
I'm not sure who the absolute best is, but there might be some well - known authors in the fanfiction community. You could look for those with high ratings and a lot of positive reviews on fanfiction platforms.
There's also 'Shaggy and the Enchanted Harem'. In this fanfiction, Shaggy stumbles upon a magical realm where he is surrounded by a harem of unique characters. It's full of humorous moments as Shaggy tries to navigate this new world while dealing with the different personalities in his harem.
One good one could be 'The Mystery of the Lost Friendship'. It shows Shaggy and Scooby getting into a small fight over a Scooby Snack shortage but then making up in a really heartwarming way. It has a lot of their classic interactions like Scooby being scared and Shaggy trying to comfort him.
One popular one might be 'Shaggy and Daphne's Unseen Adventure' where they go on a journey to a hidden magical land together and their relationship deepens. It has a lot of sweet moments between them.
Another good one is about the 'Talking Dog'. A man found a dog that could talk. He was so excited and thought he could make a fortune. He took the dog to a talent agent. But when they got there, the dog just sat there and wouldn't say a word. The man was so disappointed. As they left, the dog said to the man, 'I only talk when I have something important to say. And those talent agents are not worth my words.'
There is a fanfiction titled 'Scooby and Shaggy's Time - Travel Tale'. In this story, they accidentally travel through time while chasing a mystery - making villain. As they journey through different eras, they face new challenges and learn more about their friendship. Also, 'The Mysterious Island with Scooby and Shaggy' is a fanfic that takes them to an uncharted island full of strange creatures and secrets.
I'm not sure specifically which 'shaggy ghoul school lemon fanfiction' stories are good. You could try searching on fanfiction - specific websites like Archive of Our Own or FanFiction.net. There might be some interesting works there, but it really depends on your personal taste for different writing styles and plot twists within this rather specific genre.
One great story could be about Commander Thorn's early days in the military academy. It might show his determination and the challenges he faced while training. Another could focus on a mission where he has to make a tough decision that tests his loyalty to the Republic.
One popular shaggy vampire fanfiction might be 'The Mysterious Shaggy Vampire'. It could involve a unique take on vampires where the character Shaggy has some vampire - like traits. Maybe he has an insatiable thirst but for something other than blood, like a special type of food. Another could be 'Shaggy's Vampire Adventure' which could detail his journey in a world filled with vampires and how he manages to survive using his wits and his laid - back personality.
One popular scooby x shaggy fanfic might be 'The Mystery of the Lost Bond'. It delves into their friendship in a new mystery adventure. Another could be 'Shaggy's Secret', which explores some untold aspects of Shaggy's character in relation to Scooby. There's also 'Scooby and Shaggy's Great Escape' that has them facing challenges together in a unique way.