Definitely Simba and Pikachu. Simba as the rightful king of the Pride Lands represents leadership and courage. Pikachu, being one of the most popular Pokemon, is full of energy and has a strong sense of loyalty. They could form an unlikely but strong friendship in the crossover.
The main characters could be a young lion cub who discovers a strange device (a Pokeball). When he touches it, a Charmander pops out. The cub and Charmander then become fast friends. They explore the Pride Lands together, facing challenges from other animals who are scared of Charmander's fire - breathing ability. Nala could also be a main character, being the cub's friend and helping him and Charmander to prove that the Pokemon is not a threat. This group of characters would drive the story forward as they deal with the reactions of the Pride Lands' inhabitants to the presence of the Pokemon.
I think Ash Ketchum from the Pokemon world could be a main character. He arrives in the Pride Lands with his trusty Pikachu. Alongside Simba, they could be the main characters. Ash could bring his knowledge of Pokemon and how to train them, while Simba could teach Ash about the ways of the Pride Lands. And then there's also Scar, who could be a sort of antagonist in the story, maybe teaming up with some evil - natured Pokemon.
The main characters would be Naruto, Simba, and Mufasa. Naruto enters the Lion King world and meets Simba. But through some magical or spiritual connection, he also gets to interact with Mufasa's spirit. Mufasa's wisdom combined with Naruto's skills and Simba's leadership would form the core of the story. They would face challenges together, like threats to the Pride Lands or internal power struggles within the animal kingdom.
Harry Potter and Simba would likely be main characters. Harry with his magic skills and Simba with his leadership in the Pride Lands could team up for some great adventures.
In a 'lion king meets humans' fanfiction, Mufasa could still be a crucial character even though he is dead in the original story. His spirit could guide Simba in dealing with the new situation of meeting humans. As for the humans, it could be a family who got stranded in the Pride Lands. Each member of the family has different reactions to the lions, and this family dynamic along with their interactions with the lions could form the main plot of the fanfiction.
The female characters like Nala and Tarzan could also have interesting interactions. Nala might be curious about Tarzan's way of life. She could ask him about the jungle, and Tarzan could be impressed by Nala's hunting skills. The other animals in the Pride Lands, such as Timon and Pumbaa, would probably be both scared and fascinated by Tarzan. They might make jokes about his strange appearance at first, but then grow to like him as he helps them with things like finding new sources of food or protecting them from danger.
Balto would probably be in awe of the large and majestic lions at first. The lions, especially Simba, might be curious about this strange wolf - like creature. They would likely communicate through body language and simple sounds at first, until they start to understand each other better.
The main characters would be Sly Cooper and a Pokemon like Eevee. Eevee has the ability to evolve into different forms, which could add an interesting element to the story. Sly Cooper could befriend Eevee and together they face various challenges. There might also be some secondary characters like Sly Cooper's gang members and other Pokemon trainers or Pokemon that they encounter during their adventures in the crossover world.
One possible plot could be that Pikachu, the most iconic Pokemon, gets transported to the Pride Lands. There, he befriends Simba. Pikachu uses his electric powers to help Simba fight off the hyenas when they try to take over the Pride Lands again. Together, they show that friendship between different species can be very powerful.
A Lion King Transformers crossover fanfiction would likely involve a lot of character interactions. The Transformers, being from a completely different universe, would have different values and ways of life. But they could find common ground with the animals in The Lion King. For instance, the Autobots' fight for peace could align with the lions' desire to protect their home. The Decepticons, on the other hand, might see the Pride Lands as a place to conquer for resources. This would set up a great conflict, with the lions and Autobots teaming up to fight against the Decepticons.
Another option could be a new character. A young girl who has always been fascinated by both Pokémon and Digimon. She could be the bridge between the two worlds. She might start with a simple Pokémon like a Pidgey and a rookie Digimon like a Guilmon. As the story progresses, she helps both Pokémon and Digimon understand each other better and faces challenges that come with the crossover, like dealing with different rules of evolution and battle in each world.
The main characters are Simba, the young lion who becomes king. Scar, his evil uncle. Mufasa, Simba's father and the former king. And there are also Timon and Pumbaa, Simba's friends in the jungle.