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.
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.
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.
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.
One common theme is the clash of different cultures. For example, when the Lion King world crosses with another, like 'Aladdin', there's a difference in the way the characters from each world view things like power, friendship, and family. Another theme is the idea of unity. Characters from different universes often have to come together to face a common threat.
A possible plot could be a Pokemon trainer getting lost and ending up in the Pride Lands. He has to use his Pokemon to survive and also make friends with the Lion King characters.
The main characters would be a mix from both sides. From the Gokaigers, we would have Captain Marvelous, who is bold and adventurous. He would be a great counterpart to Kion from the Lion Guard. Kion, with his sense of responsibility and the power of the Roar, would be a central figure. Also, other members of the Gokaigers like Joe Gibken, who is more of a tech - savvy character, could interact with the Lion Guard in interesting ways. For instance, he could help the Lion Guard understand some strange technological threats using his knowledge, while the Lion Guard could teach the Gokaigers about the natural magic and powers in their world.
Timon and Pumbaa could also be main characters in a different way. For example, they could be the ones trying to play matchmaker for two lions who are too shy to admit their feelings for each other. Their comical attempts at matchmaking could add a lot of humor to the fanfiction.
The idea of Pokemon having the same social structures as the animals in the Lion King is very creative. For instance, electric - type Pokemon might form a group like the hyenas, being mischievous but also having their own hierarchy. And the grass - type Pokemon could be like the antelopes, being peaceful but having to be on guard against the 'predator' - like Pokemon.