Well, Doctor Strange is a top choice. He's the central figure in the Multiverse of Madness concept. His different versions in the multiverse can be really exciting to write about. Scarlet Witch is also high on the list. Her powers and her connection to the multiverse are fascinating. And then there's America Chavez. Her ability to travel through the multiverse makes her a key character to write about. You can create all sorts of adventures for her.
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.
Voldemort can be really interesting. You can explore his past, his reasons for turning evil, and what might have been different if certain events in his life had changed. Another is Severus Snape. His complex character, with his love for Lily and his double - agent role, offers a lot of room for creative writing. And then there's Sirius Black. His wild and rebellious nature, along with his family history, makes for great fanfiction material.
Some characters might be in awe. For instance, Thor could be excited to see different versions of himself and his friends. He might see a version of himself that is even more powerful or a version of Loki that is actually good, and it would be a shock but also a source of amusement for him.
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.
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.
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.