Rimuru Tempest is an obvious choice as he is the main character in the original series. He has a lot of potential for further development in fanfics. Veldora is also popular. His powerful dragon form and his comical personality can add a lot of fun elements to the story. And Shizu, her backstory and connection to Rimuru make her a great character to include.
Rimuru is a must - have as he is the protagonist. But don't forget about Diablo. His menacing appearance and his extreme loyalty to Rimuru can be used to create some intense and interesting scenarios. Also, Gabiru. His over - the - top pride and his growth as a character can be really fun to write about in a fanfic.
Rimuru is a must - include character. As the main character in the original work, he can be the central figure in fanfiction too, with new adventures or relationships. Another popular one is Veldora. His powerful and somewhat comical personality can add a lot of fun elements to the fanfiction.
Veldora is another favorite. His power and his somewhat comical yet powerful nature make him interesting in fanfiction. There could be stories where he takes on a more mentoring role to Rimuru or gets involved in unexpected adventures.
Rimuru is definitely one of the most interesting characters. His transformation from a human in his past life to a slime in this new world and his growth is captivating. Another interesting character is Veldora. He's a powerful dragon with a unique personality.
Shion is an interesting character. She's a strong ogre who is extremely loyal to Rimuru. Her clumsy yet endearing nature, especially when it comes to cooking, adds a touch of humor to the story. Then there's Benimaru. He's a very capable leader among the ogres. His respect and admiration for Rimuru, and his own skills in combat and strategy, make him a great addition to the cast.
Often, original characters that are powerful yet have a mysterious backstory tend to be popular. For instance, a character who is a powerful mage but has a past linked to a long - lost magic artifact. They add an element of intrigue to the fanfiction.
The legendary Pokemon that the protagonist may interact with can also be very popular characters. For instance, if the story involves a close relationship with Arceus, that character would be highly regarded. Arceus being the creator of the Pokemon universe has a lot of mystery and power associated with it, and seeing how it interacts with the reincarnated character can be really exciting for readers.
In some slime fanfics, there are magical girls or boys who encounter the slime. These characters are popular as they bring their own set of powers and personalities to the story. They might initially be scared of the slime but then learn to work with it.
Shizue Izawa could also be a common crossover character. She has a connection to both the slime world and has some similarities to Naruto in terms of her own journey. She might help Naruto adapt to the slime world, or Naruto could potentially change some of the events in her story because of his different perspective and abilities.
Rimuru is definitely the most memorable. He's the protagonist and his journey from being a human who got reincarnated as a slime to becoming a powerful leader is fascinating. His kind - hearted nature combined with his unique abilities make him stand out.
The protagonist who is reincarnated as Harry Potter is obviously very popular. Readers are interested in how they navigate the world with their new - but also familiar - identity. Hermione Granger is also popular as she often has interesting interactions with the reincarnated character. Her intelligence and strong - willed nature make her a great character to include in these fanfics.