Cas (Castiel) and Shaggy would be an interesting combination. Cas is an angel who doesn't always understand human behavior, and Shaggy is this skittish but kind - hearted character. Cas might be confused by Shaggy's fear of everything, but also find his simple kindness endearing. Shaggy, on the other hand, might be initially terrified of Cas but then realize he's a friend. It could lead to some really cute and comical interactions in the fanfiction.
Vivi and Velma would make an interesting pairing. Vivi has her own knowledge of the supernatural world, and Velma is the brains of the Scooby Doo gang. They could share their insights and research methods, and Vivi might introduce Velma to some new concepts in the supernatural realm that Velma has never considered before.
Well, for one, Harrison Wells from Flashpoint and Castiel would be really interesting. Wells is a brilliant scientist, and Castiel is an angel. Wells could be intrigued by Castiel's otherworldly nature and try to study him, while Castiel could use Wells' knowledge to better understand the science - based threats in the Flashpoint universe. Another cool combination would be Felicity Smoak from Flashpoint and Rowena from Supernatural. Felicity is a tech - genius, and Rowena is a powerful witch. They could either be rivals, with Felicity trying to use her tech to counter Rowena's magic, or they could team up and create some really powerful spells or gadgets. And then there's Oliver Queen from Flashpoint and Sam Winchester. Oliver is a skilled archer and fighter, and Sam is a hunter. They could share their combat techniques and knowledge, and together they could take on some really tough opponents in both the Flashpoint and Supernatural worlds.
I think Pikachu would be really interesting. It's so cute and energetic. In the fanfiction, it could use its electric powers to light up spooky places that Scooby Doo and the gang are exploring. Also, its reactions to all the strange things in Scooby Doo's world would be hilarious.
Naruto and Shaggy could be an interesting pairing. Naruto's high - energy and brave nature could contrast with Shaggy's cowardly but kind - hearted personality. They could learn from each other. Naruto could teach Shaggy to be more courageous, and Shaggy could introduce Naruto to some delicious human world food.
Naruto and Scooby would be a really interesting pairing. Naruto's energy and enthusiasm would contrast with Scooby's cowardice. Naruto could encourage Scooby to be brave and Scooby could teach Naruto about having fun even in scary situations. Also, Naruto's ability to make shadow clones could be used in really creative ways to help solve mysteries, like sending clones to different areas while Scooby and the gang follow the main clue.
One creative storyline could be that the Winchester brothers get stuck in a town haunted by a ghost. The Scooby Doo gang shows up to solve the mystery. Sam and Dean initially think the gang is just a bunch of amateurs, but they soon realize that the gang's skills in unmasking fake ghosts could be useful in their real - life hunting. Another idea is that a demon has possessed one of the Scooby Doo characters, and the Winchesters have to figure out which one and exorcise the demon without scaring the rest of the gang too much. A third could be that there's a cross - dimensional rift that pulls the two groups together to stop an ancient evil that is using both the Supernatural and Scooby Doo universes as its playground.
One interesting aspect is the character interactions. For example, when Scooby Doo and his gang cross over with characters from other shows, we get to see how their personalities clash or complement each other. It can be really funny to see the cowardly Scooby interact with a very brave character from another series.
Definitely Brennan and Crane. Their different worldviews would create a great dynamic. Brennan is all about facts and science, while Crane is from a time where superstition was a big part of life and he has first - hand experience with the supernatural. Their interactions would be full of tension and learning opportunities for both characters. For instance, Brennan could try to explain the Horseman's existence through scientific means, while Crane would be trying to get her to accept that some things are beyond science.
I think Velma is an interesting character to write about in 'A pup named scooby doo' fanfiction. She's the brains of the group, so you can write about her coming up with brilliant plans to solve mysteries. And Fred too. His leadership skills and his knack for setting up traps can be the focus of some really cool fanfiction stories.
One idea could be that the Winchester brothers are hunting a ghost in a town where the Mystery Machine gang also happens to be. The Scooby gang initially mistakes the Winchesters for bad guys but then realizes they're all after the same spooky entity. They could team up, with Sam using his research skills and Dean showing the Scooby gang how to handle real weapons (in a non - dangerous way, of course).