Well, aside from the obvious ones like Superman and Batman, Martian Manhunter is a great character to include. His alien nature and diverse powers such as shape - shifting, invisibility and telepathy can add a whole new layer to a crossover. Then there's Cyborg. His half - human, half - machine nature can create some really interesting interactions with other heroes, especially those with more traditional powers. And Harley Quinn, even though she's more of a villain, her chaotic and unpredictable nature can make for some really fun crossovers with the heroes.
Some of the robotic or non - human characters are also well - liked. Alpha 5 from Power Rangers could be really interesting when paired with a similar type of character from the Super Sentai series. They could have a tech - based sub - plot where they try to upgrade their respective teams' weapons or communication devices. It adds a different dynamic to the story compared to just the human heroes interacting.
Definitely Naruto and Superman. They are both iconic characters in their respective universes. Their different power sets make for an interesting comparison. Another popular crossover is between Sasuke and Batman. They both have a dark and brooding side. And of course, Sakura and Wonder Woman. The contrast between Sakura's ninja skills and Wonder Woman's superhuman abilities is appealing.
Percy Jackson is often a very popular character. His powers and his journey in the original 'Heroes of Olympus' series make him a great candidate for crossovers. Writers like to put him in different situations and see how he reacts, especially when paired with characters from other fandoms.
Definitely Venkman. His sarcastic and witty personality can create great interactions in crossovers. For instance, if he were in a crossover with the X - Men, his humorous take on the mutants' powers would be hilarious.
Hajime Nagumo from 'arifureta' is a popular choice. His overpowered abilities and his journey from being a weakling to a powerful hero make him an interesting character to put in crossovers. Yue is also very popular. Her magic and her relationship with Hajime can add a lot of depth to a crossover story. Another character is Shea. Her energetic and somewhat naive personality can create humorous and interesting interactions in a crossover.
Akagi is another fan - favorite. Her character has depth and mystery. In a crossover, she could be the key to unlocking some complex plotlines, perhaps she has a connection to a powerful artifact in another world or has some hidden knowledge that is crucial for the story.
In Ben 10 crossover fanfiction, many writers like to include Azmuth. As the creator of the Omnitrix, he has a wealth of knowledge and power. His presence can add a layer of depth to the story, especially when it comes to explaining the science behind the Omnitrix or helping Ben understand new alien forms. Also, Charmcaster is often included. Her magic abilities can create some interesting dynamics when combined with Ben's alien powers in a crossover.
Joker is definitely one of the most popular. His cool and mysterious demeanor makes him a great fit in various crossovers. Also, Morgana is often included as his sidekick. Another popular character is Makoto, with her strong - willed and intelligent personality.
Batman himself is obviously a must - include. His leadership and skills are central to the Batfamily dynamic. Also, Robin, especially Damian Wayne as his complex relationship with Batman adds a lot of drama. Nightwing is popular too, with his acrobatic skills and his own journey away from being Robin. Batgirl, like Barbara Gordon, is often included for her intelligence and fighting abilities. And Alfred, the ever - loyal butler, who often provides support and wisdom to the family.
John Connor is often a popular choice. His leadership skills and importance in the Terminator series make him a great character to bring into other fictional universes. For example, in a crossover with a superhero world, he could be seen as a strategist working with the heroes.