The Batman Who Laughs is extremely popular. He combines the intelligence and skills of Batman with the insanity of the Joker. His twisted nature and his dark plans make him a fascinating character in fanfiction.
Superman, but not the traditional one. In Dark Multiverse fanfiction, we often see versions of Superman where he has been corrupted. Maybe he was raised in a different environment or exposed to some dark energy. These 'evil' Supermans are very interesting to explore as they turn the symbol of hope into a symbol of fear.
Ash Ketchum is often a very popular character in pokemon multiverse fanfiction. Since he's the main protagonist in the original series, fans like to put him in different multiverse scenarios. Another popular one is Team Rocket's Jessie and James. Their comical antics can be explored in different universes. And of course, many of the legendary Pokémon are popular characters in fanfiction. They often have important roles and are central to many multiverse storylines.
Well, Weiss is quite popular in RWBY Multiverse Fanfiction. Her growth as a character, from a somewhat spoiled heiress to a strong fighter, is explored in different ways in the multiverse. Ruby is always a top pick too. Her determination and unique abilities like her speed and scythe - wielding skills are fun to play around with in different multiverse settings. And Pyrrha, even though she had a tragic end in the original, is often resurrected or given different fates in fanfiction, which makes her popular as well.
Definitely Naruto and Sasuke. They are the two main characters in the original Naruto series, and in multiverse fanfiction, their different versions are often central to the stories. For example, a story might focus on a Naruto who was raised differently and how that affects his relationship with Sasuke. Hinata is also popular as she has a lot of potential for character development in different multiverse scenarios, especially in relation to Naruto.
Well, aside from Goku and Vegeta, Trunks is quite popular. His time - traveling adventures and his role as a protector in some of the alternate universes are often explored. Another popular character is Piccolo. His unique abilities and his relationship with Goku and the other Z - Fighters provide rich material for fanfiction writers. He can be written as a wise mentor or a powerful fighter in different multiverse scenarios.
Obviously Naruto himself is very popular as the main character. His new 'god' abilities and his adventures across the multiverse draw a lot of attention.
Miles Morales is quite popular. He brings a fresh perspective to the Spider - Man story with his own unique origin and powers. Peter Parker is of course always a main character as the classic Spider - Man. Gwen Stacy as Spider - Gwen also has a lot of fans in fanfiction. Her different take on the Spider - Man concept, being a female version, makes for interesting stories.
Sam and Tucker are also quite popular. In the multiverse fanfiction, they can have different roles. Maybe in one story, Sam has some hidden ghost powers of her own and becomes a key player in a multiverse adventure. Tucker could be a tech - genius in one universe and a powerful magician in another, adding new dimensions to their characters.
Superman is also quite popular in 'naruto dc fanfiction'. The idea of the all - powerful Kryptonian interacting with the energetic ninja Naruto has a lot of appeal. His moral code and superpowers create an interesting dynamic when combined with Naruto's world of ninjas and chakra.
Spiderman himself is obviously very popular. He brings his unique charm, his quippy personality and his amazing powers to the DC - based fanfiction. Batman is also quite popular in these crossovers. His brooding nature and detective skills contrast well with Spiderman's more upbeat and acrobatic style. Superman is another one. The idea of Spiderman interacting with the Man of Steel, whether as friends or rivals, is always an interesting concept in fanfiction.
Naruto himself is often a popular choice. Since he's the main character in the original series, seeing how he reacts in different multiverse situations is always interesting. His positive attitude and determination can contrast or complement other versions of himself.