There could also be a character who is a mix of both worlds. For example, a character who was born in the wild west but got some 'Infamous' - like powers later. This character would have to navigate between two very different identities and worlds, making them a really interesting main character.
Cole MacGrath from 'Infamous' could be a main character. His electric powers would be really cool to see in the wild west. He could use his powers to stop outlaws or protect a town from bandits.
One interesting concept could be the clash of different cultures from the wild west and the 'Infamous' universe. For example, how the moral codes of the wild west, like justice served by gunslingers, might interact with the super - power - based justice in 'Infamous'.
Obviously, Hans would be one of the main characters. He would bring his own set of characteristics and abilities into the Hellsing universe. Alucard is also likely to be a main character as he is one of the central figures in Hellsing. His overpowered nature and complex personality would create interesting interactions with Hans.
Obviously, Gaster himself is likely to be a main character. His mysterious nature makes him a central focus as readers are eager to learn more about him. Another potential main character could be Frisk. Their ability to reset and influence the game's world could be very interesting when combined with Gaster's enigma. They could either be allies or have some sort of conflict due to their different understandings of the world.
Obviously Percy himself. There could also be some of his friends from his normal life who come to visit him in the wild or maybe even join him, like Annabeth. And then there could be various wild animals that act as characters, like a wise old owl or a friendly deer.
Well, aside from Percy himself, there could be a wise old owl as a mentor figure. The owl could teach Percy about the secrets of the wild, like which plants are safe to eat and which are poisonous. There might also be a wild horse that Percy befriends and rides. This horse could be his loyal companion during his adventures in the wild.
Harry Potter would be the central figure, no doubt. But I can also see Neville Longbottom being an important character. In the Wild West, he could have grown into a brave and resourceful wizard, maybe using his knowledge of plants to create unique potions that help in battles. Luna Lovegood could also be there, with her eccentric views adding a different perspective. And of course, there would be some local Wild West characters like a shrewd saloon owner who has a hidden past related to magic.
Well, Naruto is the main one for sure. Then there might be some local heroes in the Western world who initially see Naruto as a threat but later become his friends. There could also be villains, like a power - hungry duke or a dark sorcerer who wants to stop Naruto from becoming the emperor. And don't forget about some common folk characters who Naruto tries to protect and win over.
Jackie Estacado from 'the darkness' is an obvious choice. His connection to the Darkness power makes him a central figure and his skills and personality can drive the story forward in a crossover.
One potential crossover character could be Harry Potter. Imagine Naruto, with his immortality, meeting Harry in the wizarding world. Naruto could teach Harry some ninja skills, and they could fight together against Voldemort. Another could be Superman. The contrast between Superman's superpowers and Naruto's ninja skills, along with Naruto's immortality, would make for an interesting story.
Another potential character is Harry Potter. His wizarding skills and knowledge of magic could be a contrast to Naruto's ninja abilities. Imagine Naruto in Hogwarts, learning about magic while also showing off his ninja moves. They could also face a threat together, like a dark wizard who is trying to use both magic and chakra for evil purposes.