An ancient monster - hunter from a long - forgotten tribe. This character could have knowledge passed down through generations about how to deal with powerful creatures like Godzilla and Mechagodzilla. They might have unique weapons or techniques that could potentially be used to either stop or control the two monsters. Their inclusion would bring in an element of mystery and ancient lore to the fanfiction.
A young and fearless journalist could be an interesting addition. This character could be on a mission to expose the truth about the battles between Godzilla and Mechagodzilla. They would go to great lengths to get close to the action, interviewing scientists and military personnel. Their presence could add a human element to the story and also create some tense moments as they often find themselves in the middle of the chaos.
One idea could be a story where Mechagodzilla is initially built to protect the city from Godzilla, but then they discover a common enemy that forces them to team up. Maybe an alien force arrives that threatens both of them and the planet. So they have to put aside their differences and fight together.
I think Hulk would be the most interesting. He's all about brute strength and smashing things. Facing Godzilla, he'd be like a tiny but very angry force against a huge monster. It would be a battle of the titans in a sense, and seeing how Hulk reacts to Godzilla's size and power would be really exciting.
Eren could be really interesting. Given his ability to transform into a Titan, he might be curious about Godzilla and try to understand his power. He could also see Godzilla as a rival in terms of power and might try to prove himself by interacting with Godzilla in some way.
Clockwork could be a really interesting addition. He has so much knowledge about the past, present, and future of the Ghost Zone. He could either help Danny in his fight against Pariah Dark or be a bit of an enigma, not really taking sides but still influencing the events. His time - related powers could also add a whole new layer of complexity to the story.
Godzilla himself is of course a key character. Focusing on his perspective could be really unique. Maybe we see his thoughts as he encounters the Jaegers and these strange new kaiju. We could explore his instincts and how he decides whether to fight or cooperate with the humans and their giant machines.
I think Kakashi would be very interesting too. His experience and wide range of jutsu would be valuable in a zombie - filled world. He could use his Sharingan to copy any unique abilities the zombies might have and use it against them.
Gandalf would be really interesting. He could interact with Dumbledore and they could exchange their knowledge of magic and wisdom. They are both powerful and respected figures in their respective worlds. Gandalf could also teach the Hogwarts students about different forms of magic that are more nature - based like his own.
One interesting pairing could be Godzilla and Hulk. Both are powerful, almost indestructible forces of nature. They could have an epic battle at first, as they both have a tendency to lash out when provoked. But then they could end up teaming up against a greater threat, like a powerful alien invasion. Another great pairing would be Godzilla and Iron Man. Iron Man could use his technology to study Godzilla, and perhaps even try to create some sort of armor inspired by Godzilla's abilities. And Godzilla could provide a physical presence that Iron Man could rely on in a fight. Also, Godzilla and Thor could be a fascinating pair. Thor's god - like powers and connection to nature could be paralleled with Godzilla's own primordial power. They might have a mutual respect for each other's strength.
Jack Sparrow from 'Pirates of the Caribbean' would be a great addition. His wily and unpredictable nature would add a new dynamic to the Jumanji adventure. He could use his skills of deception and sailing knowledge, even if there's no sea in Jumanji, to outwit the game's challenges.
Kirby would be really interesting. His innocent appearance combined with his extremely powerful abilities makes for a great contrast. He could be the source of both humor and unexpected plot twists. For example, when he first meets Naruto, Naruto might try to offer him ramen, not knowing Kirby's preference for food is more about swallowing enemies. And Kirby's reactions to the different jutsu in the Naruto world could be really fun to write about.