I think Alice could be a very powerful character in the crossover. She can see the future, which would give her group a huge advantage. They could avoid dangerous situations with walkers or other threats before they even happen. And her speed and fighting skills as a vampire would also make her a force to be reckoned with.
It would probably be Naruto. His ability to summon large amounts of chakra and perform powerful jutsus like the Rasengan and Sage Mode would make him extremely formidable against zombies. He could also use his chakra to sense the presence of the undead from a distance, giving him an edge in survival.
It could be really interesting. Imagine Daryl from The Walking Dead in the world of Twilight. Daryl's survival skills would be put to a very different test. In the Twilight world, there are vampires and werewolves. Daryl, being used to fighting zombies, would have to adapt to these new threats. Maybe he'd form an unlikely alliance with the Cullens against a new kind of undead that combines the traits of zombies and vampires. His crossbow would be a unique weapon in that world full of supernatural powers.
One plot idea could be that Daryl is bitten by a strange creature in The Walking Dead world, and instead of turning into a zombie, he's transported to the Twilight world. There, he discovers that the bite has given him some sort of immunity or power that the vampires and werewolves are interested in. He has to navigate the politics of the Twilight world while also trying to find a way back home. Another idea is that the zombie virus somehow spreads to the Twilight world, and Daryl teams up with the Twilight characters to stop it from taking over. His knowledge of fighting the undead would be crucial in this situation.
Well, perhaps the Cullens could form an alliance with a group of survivors from The Walking Dead. They could use their knowledge of the area around Forks and their skills to help each other. For example, the vampires could protect the humans at night when the walkers are most dangerous, and the humans could help the vampires during the day when they are more vulnerable. And what if Bella's special ability as a shield could be used to protect a whole group from the walkers?
In a crossover fanfic, the angels and demons from Supernatural could be involved in The Walking Dead universe. For example, an angel might be sent to Earth to stop the spread of the undead, believing it's part of a grand plan to save humanity. Meanwhile, the demons could be taking advantage of the chaos, making deals with desperate survivors. The Winchester brothers would have to navigate this new dynamic while also dealing with the walkers.
First, choose the other universe you want to cross with. For example, if it's a superhero universe, think about how the powers would work in a zombie - infested world. Then, plan your characters' interactions. Will they be allies or enemies? Also, keep the tone of "The Walking Dead" - dark and gritty. Don't be afraid to make tough decisions for your characters.
A popular "Walking Dead" crossover fanfiction involves a crossover with "Game of Thrones". Imagine the politics and power struggles of "Game of Thrones" combined with the zombie apocalypse of "The Walking Dead". It's a wild ride as characters like Daryl Dixon and Jon Snow interact, with lots of unexpected plot twists.
If we consider a crossover with 'Star Trek', Captain Kirk would be a fascinating character to include. He's used to exploring new worlds and dealing with strange situations. In 'The Walking Dead' universe, he could use his leadership skills to organize the survivors. His optimistic and adventurous spirit might inspire the survivors to look for a better solution than just constantly running and hiding from the zombies.
Most likely Alucard. In the Hellsing universe, he is an extremely powerful vampire with a vast array of abilities. In comparison, the vampires in Twilight, while having their own strengths, seem rather weak when pitted against Alucard. He can manipulate shadows, has superhuman strength far beyond what we see in Twilight vampires, and his immortality is of a different level altogether.
It's likely Klaus Mikaelson. He's an Original vampire - werewolf hybrid in The Originals. He has super strength, speed, and his werewolf side gives him an edge in combat. In comparison, the vampires in Twilight, while strong, don't have the added advantage of being part werewolf. Also, Klaus has a lot of experience and is very cunning, which would make him a formidable force in a crossover situation.