Definitely include Zak Saturday. He has his unique connection to the Cryptids and his own set of skills. Also, Raven from 'Teen Titans' would be a great addition. Her dark powers and mysterious nature would contrast well with the more action - based world of the Secret Saturdays.
Ben Tennyson from 'Ben 10' is a must - include. His ability to transform into different aliens could add a whole new dynamic to the story. And of course, Scooby - Doo and Shaggy. Their comical antics would provide some light - hearted moments in what could be a high - stakes fanfiction.
Characters from 'Teen Titans' could be great. Their superpowers and the Saturdays' knowledge of the supernatural could lead to some amazing adventures. Imagine Raven's magic and Beast Boy's shape - shifting working together with the Saturdays. Also, characters from 'Gargoyles' could be interesting. The Gargoyles' nocturnal nature and combat skills along with the Saturdays' would create a really unique dynamic in the fanfiction.
In addition to the Saturdays family, there could be other recurring characters in different fanfictions. For example, some might introduce a new young cryptid hunter who teams up with Zak. This character could have a different set of skills and a backstory that adds more depth to the story. Maybe they come from a long line of hunters but have a more modern approach compared to the Saturdays. However, the core always remains the Saturdays family as they are the central part of the original concept.
One idea could be a crossover with 'Ben 10'. The Secret Saturdays could team up with Ben to fight a common enemy that is threatening both their worlds. Maybe an ancient alien force that wants to take over Earth and has knowledge of both the Cryptids and the Omnitrix.
Sasuke can also be a popular character. His brooding nature and powerful Sharingan can add a lot of depth to the fanfiction. In a Naruto Secret Saturdays crossover, he might be intrigued by the different powers and creatures in the Secret Saturdays world and try to gain more power from them.
One idea could be to cross it with another adventure - themed show. For example, the characters from 'The Secret Saturdays' could team up with characters from 'Ben 10' to fight a common enemy that threatens both their worlds. They could combine their unique skills and powers to defeat the bad guys.
There are fanfictions that might explore the relationships between the characters more deeply. For example, a story about how Doyle and Zak become even closer friends through a shared difficult experience. It could involve them getting lost in a dangerous part of the cryptid world and having to rely on each other's skills to survive. Also, some fanfictions might give more backstory to the villains, making them more complex and interesting.
In a Dorohedoro crossover with 'One Punch Man', Saitama would be an interesting addition. His overpowered nature would contrast with the often - more - gritty and complex power levels in Dorohedoro. Another good character could be Guts from 'Berserk'. His dark and brooding personality would fit well in Dorohedoro's gloomy atmosphere. Also, Edward Elric from 'Fullmetal Alchemist' could bring his knowledge of alchemy and his quest for truth to the Dorohedoro world.
In vegito crossover fanfiction, characters like Jiren would be great. His strength and stoic nature would make for some intense interactions with Vegito. Also, Android 18 could be included. She has her own unique set of powers and a strong will. Her presence could add some interesting dynamics, especially if she has to team up with Vegito against a common enemy. And don't forget Frieza. His evil nature and thirst for power always make for an exciting addition to any Dragon Ball - related story.
Kenny McCormick (Mysterion) could cross paths with Batman. Batman's detective skills and high - tech gadgets would make for an interesting dynamic with Mysterion's more 'underground' superhero style. They could work together to solve a mystery that spans Gotham City and South Park.
For a crossover with Doctor Who, the Doctor could be an interesting addition. He could bring his time - traveling abilities and vast knowledge to the Shadow World. And from the Shadowhunter side, Jace Wayland would be a good character to include. His charm and combat skills would make for some interesting dynamics with characters from other universes.