Some of the lesser - known Kaiju can also be interesting to include in fanfiction. For example, Rodan. He has his own unique abilities and personality. A fanfiction could explore his backstory more deeply, or create a new relationship between him and the other more well - known Kaiju. Anguirus is another one. He could be portrayed as a loyal ally to Godzilla, or have his own motives for being involved in the Kaiju Wars.
One idea could be to write a story from the perspective of a civilian caught in the middle of the Kaiju battles. Show their fear, their attempts to survive, and how they interact with the military trying to stop the Kaiju. Another could be a story about a Kaiju that has unique abilities not seen in the original lore, and how it changes the dynamic of the wars. Maybe it could be a Kaiju that can communicate with humans and tries to form an alliance against the more destructive Kaiju.
Kafka Hibino is often a popular character in fanfics. His transformation into a kaiju - like form and his struggles to control it make for great storytelling. Writers can explore his inner thoughts and how he copes with his new abilities.
The main character, Kafka, is often a popular one in fanfiction. Writers might put him in various new situations or develop his character further, like exploring his emotions more deeply during battles.
Often, the main human protagonists who are brave and resourceful are popular. For example, a fearless military general who leads the fight against the Kaiju. Also, any character with a special ability like a scientist who can understand the Kaiju's behavior.
Blake Belladonna is quite popular in RWBY Kaiju fanfiction. Her stealth abilities can add an exciting element when she has to sneak around a kaiju or gather intel on it. Yang Xiao Long is another favorite. Her powerful punches could be portrayed as being able to at least stun a kaiju for a short time, and her fearless attitude makes her a great character to face these huge monsters. Also, characters like Qrow Branwen might be popular as they can bring in their experience and unique skills to deal with the kaiju situation.
Kaiju novels often portray kaiju as gigantic and powerful beings. They are usually depicted as forces of nature that are difficult to control or defeat. For example, in 'Godzilla' novels, Godzilla is shown as a nearly indestructible creature with its atomic breath and massive size.
One popular 'kaiju x kaiju fanfic' story could be about Godzilla and Mothra forming an alliance in a unique way. Maybe they team up against a new, more powerful enemy that threatens their world.
Yang would be a likely character. She's bold and not one to back down from a challenge. She might see Godzilla as a huge opponent to test her strength against. Maybe she'd start off trying to punch it, only to realize that brute force alone won't work and then have to figure out a more strategic way to interact with it.