Definitely include Randall from Monsters University. His sneaky and devious nature can add a lot of conflict in a crossover. If it's a crossover with a magical world, he could try to steal some magic for his own gain. Another good character is Celia Mae. Her relationship with Mike can bring some romantic subplots or comedic moments. For example, if they cross over into a high - school - type setting from another movie, Celia Mae could be the popular girl while Mike tries to win her over in a new and different way.
Art is a great character to add. His fun - loving and carefree attitude can lighten up the mood in a crossover. If it's a crossover with a post - apocalyptic world, Art could be the one still finding the good in everything and trying to make friends with all the strange new creatures. And then there's Squishy. His innocent and kind - hearted personality can be a source of moral support for other characters. In a crossover with a magical academy, he could be the one learning new spells and sharing his kindness with everyone.
Well, for a 'duel monsters crossover fanfiction', characters like Bakura Ryou could be included. His dual personality, with the evil Bakura lurking inside, can add a layer of mystery and danger. Mai Valentine is also a good option. Her strong - willed and competitive nature can create interesting dynamics in crossovers. Additionally, Mokuba Kaiba, with his youthful energy and his loyalty to his brother Seto, can be a fun character to involve, especially in crossovers where family relationships play a role.
Mike and Sulley are definitely the most popular. They are the main characters in the movie and have such distinct personalities. Mike's determination and Sulley's big - hearted nature make them great characters to interact with in fanfiction. Another popular one would be Randall. His devious nature can add a lot of drama and conflict to the story when paired with the reader. And of course, Dean Hardscrabble is also a great addition as she can be a strict authority figure that the reader has to either impress or outwit.
If it's a crossover with the Legend of Korra, Korra herself would be an excellent addition. She is a powerful bender and has a lot of experience in fighting evil. She and the Trollhunter could learn from each other's fighting styles. Asami could also be included, providing her engineering skills to help the Trollhunter with any technological needs in their battles against the common foes.
For a crossover with a post - apocalyptic world, characters like Mad Max could be involved. He might see the homunculi as either allies or threats in the harsh new world. In a crossover with a cyberpunk world, characters like Neo from 'The Matrix' could be interesting. The homunculi could be part of the complex digital and physical world that Neo navigates, and he could help them understand the true nature of their existence in this new, high - tech world.
Hermione Granger from 'Harry Potter' could be an interesting addition. She could use her magic knowledge to study the mummy. Maybe she could find a spell to control or at least understand the mummy better. It would be a really unique combination of magic and ancient Egyptian mystery.
In a crossover with 'Fullmetal Alchemist', Edward Elric could be an interesting addition. His scientific knowledge and his search for the Philosopher's Stone could interact with the strange alchemy - like aspects of Rea's resurrection in Sankarea. He might be both fascinated and appalled by what has happened to Rea.
If it was a crossover with The Evil Within, Sebastian Castellanos would be a great character to include. His detective skills and his ability to handle the nightmarish creatures in his own game could be useful in the Outlast 2 world. He could team up with the Outlast 2 character to solve the mysteries behind the horror. Also, Pyramid Head from Silent Hill could be a terrifying addition. His presence alone would heighten the sense of dread in the Outlast 2 crossover story.
Batman would be a great character to include. His no - kill rule contrasts with Deadshot's assassin nature. Their interactions would be full of tension and moral debates. Harley Quinn could also be included. Her chaotic personality could add an element of unpredictability to the story. She might team up with Deadshot for a mission or be a distraction during one of his hits.
If it's a Moana and Hercules crossover, Hercules would be a great addition. His super strength could help Moana in situations where physical power is needed, like moving large obstacles in her path. Also, Philoctetes could be there to train Moana in some combat skills, adding an interesting dynamic to the story.
Definitely include Bill Cipher from Gravity Falls as he is the main villain in Weirdmageddon. Dipper and Mabel Pines are also essential as they are the main protagonists in the Gravity Falls story. If it's a crossover with the Over the Garden Wall universe, Wirt and Greg would be interesting additions. Wirt's cautious and somewhat gloomy nature could contrast with the more adventurous Gravity Falls characters, while Greg's innocence could add a different dynamic.