One popular character could be the fearless warrior. This character is often strong and brave, leading the fight against the disasters in the burning world.
The wise old mentor is also likely to be popular. They possess knowledge about the history of the burning world and can guide the younger characters on their quests. They are the source of wisdom and often have a mysterious past.
I'm not sure specifically as I haven't read the novel. But usually in such a story, there might be a protagonist who is a symbol of hope or resistance in the 'burning world'.
I don't know as I haven't read the novel. But they could be survivors in the burning world, like a brave young man or woman.
One popular character is often Ash. Since he's a well - known trainer in the Pokemon world, in fanfics, he can be involved in romantic relationships. Maybe with a female trainer he meets on his journey. Another could be Misty, who has a long - standing relationship with Ash in the original series, and in fanfics, this relationship can be explored in a more romantic light. Serena is also popular as she has a crush on Ash in the anime, and fanfics can expand on that.
The slugcat is often a popular choice. Its small and agile nature makes it interesting to pair with characters from other universes. It can bring a sense of vulnerability and tenacity to crossovers.
Naruto himself is often still a popular character. Even in the fanfic, his determination and growth can be a central focus, and the new character reborn into the world might interact with him in interesting ways.
Edward is often still very popular in these fanfics. His brooding and mysterious nature, along with his intense love for Bella, makes him a central figure that many fans still like to explore further. They might write about his past more or create new scenarios where his vampire abilities are put to different tests.
Iron Man is often popular. His high - tech gadgets and smart - aleck personality can add a lot of fun to the crossovers. He could probably come up with some crazy plans to deal with the dinosaurs. Also, Chris Pratt's character from Jurassic World, Owen, might be popular as he has experience dealing with the dinosaurs and could interact well with the Avengers.
Blake is also quite popular. Her complex backstory and her cat - like abilities add an interesting dynamic. In different worlds, her skills of stealth and combat can be used in various ways, and her relationships with other characters, especially Yang, can be further explored in the context of world - jumping.
The loner characters can also be really interesting to feature. They have their own set of rules and survival techniques that they've developed on their own. These characters often have a mysterious past that can be explored in the fanfic. Also, characters with unique skills like a hacker who can break into pre - apocalypse security systems to access valuable resources are popular.
Often, the main character from the Pokemon games who gets transported to the Mirror World is a popular choice. For example, Ash could be a very popular character in such fanfics. His adventures in the Mirror World, where everything is different, can be really exciting.