If it's a crossover with 'Dying Light', Crane could be a key character. His parkour abilities would be a contrast to the more grounded survival in State of Decay. And from 'Mad Max', Max himself could be thrown into the mix. His vehicle - based combat and survival skills would add a different flavor to the fanfiction.
In a crossover with 'The Last of Us', Joel and Ellie would be great additions. Joel's survival skills and Ellie's immunity could bring new dynamics to the State of Decay world. Also, from 'Left 4 Dead', the four survivors like Bill, Francis, Zoey, and Louis could be included. Their combat skills against zombies could be interesting when combined with the State of Decay gameplay.
In a crossover with 'Alien', Ripley could be an amazing character to include. Her experience with fighting the Xenomorphs would be a great asset in the State of Decay world. Also, from 'I Am Legend', Robert Neville could bring his scientific knowledge and lone - wolf survival skills to the crossover fanfiction.
Well, if it's a crossover with Ultraman, Ultraman could be a great addition. His super strength and light - based powers would contrast well with the Jetman's abilities. They could have a friendly rivalry at first but then team up to face a powerful kaiju that is threatening both their worlds.
The characters who are ex - military are often popular in fanfiction. They bring discipline and combat skills to the community. Their backstories of military training and how they use those skills in the post - apocalyptic world are often explored in great detail, such as how they set up defenses and train other survivors.
Alfred Pennyworth could be included. He could offer his wisdom and support to both heroes. Maybe he even has some insights about the similarities and differences between Gotham and Starling City. Another character could be Felicity Smoak. She could help with the tech - related aspects of the case they are working on together.
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.
A 'State of Decay Crossover Fanfiction' could involve a crossover with 'Resident Evil'. Picture the State of Decay survivors coming across a Umbrella Corporation facility. They might have to deal with the bio - weapons and viruses in a whole new way compared to what they're used to in their own world. It would create a lot of action and tension.
Definitely Zeref. Since he has a connection to the Etherious and also to Natsu in the original Fairy Tail story. Another good character could be Gray Fullbuster. His ice - magic could contrast well with the more chaotic and dark powers of the Etherious. Also, Mavis Vermillion could be included. Her wisdom and powerful magic could play a role in helping Natsu deal with the Etherious side of things.
Joker is a must - include. His chaotic nature would add a lot of drama to any crossover. He could be causing mayhem that draws in characters from other universes or teams. Another one is Catwoman. Her ambiguous relationship with Batman can create interesting dynamics, especially when other characters are involved.
Well, in a Naruto - One Piece crossover, characters like Luffy and Naruto would be a must. Zoro could learn some sword - based jutsu from Naruto. And Nami might be interested in the ninja tools Naruto uses for stealth and thievery prevention on the ship.
Well, you could include characters from other Power Rangers series like Tommy Oliver. He has a lot of experience and different powers from various ranger forms. His presence would add a lot of depth and an interesting dynamic to the story. Also, Bulk and Skull could be added for some comic relief. They could accidentally get involved in the Jungle Fury Rangers' mission and cause some chaos in their bumbling way.
One potential character could be Harry Potter in a crossover with a magical world. The sirens' powers might be something new and dangerous that he has to face at Hogwarts. He could use his magic skills to try and counter the sirens' alluring voices. Another character could be Katniss Everdeen from The Hunger Games in a post - apocalyptic crossover. The sirens could be part of the Capitol's new weapon, and Katniss would have to find a way to fight against them. And in a crossover with a pirate - themed story, Captain Jack Sparrow could be included. Jack's wily nature might make him both a target and an ally of the sirens.