How about an ancient spirit that was once bound to the sun? It could be awakened in the fanfic and have a very old - fashioned way of speaking. This spirit could either be a guide for the champion, helping them understand more about their power, or it could be a bit of a trickster, causing some problems for the champion while also teaching important lessons.
A young apprentice who looks up to the champion of the sun. This character could bring in a fresh perspective and also be a source of comic relief at times. They might have their own small but unique power related to the sun, like being able to create little sun - like orbs for illumination.
His friends from the original series such as Annabeth and Grover could be in it. There might also be new characters like some minor sun and moon deities or their servants. Maybe there's a character who is a half - moon spirit and half - human who helps Percy on his journey. Also, some of the Titans who were associated with celestial bodies in Greek mythology could make an appearance.
Definitely Misty could be one. She has a long - standing relationship with Ash and might be part of the harem as she still has feelings for him. Another could be Serena, who has shown strong romantic interest in Ash in the past. Dawn might also be a character, as she and Ash have a great friendship that could potentially turn into more in a harem - like scenario.
Hermione Granger is another potential main character. Her intelligence and quick thinking would be invaluable in any competition or quest in the fanfiction. She could be the strategist behind the 'champion's champion', guiding them with her vast knowledge of magic and spells.
In a Harry Potter Dueling Champion fanfic, Draco Malfoy could be a potential rival. He has a strong sense of pride and is always eager to prove himself. His family's pure - blood heritage gives him access to some powerful magic and knowledge. Another could be Hermione Granger. She is extremely intelligent and has a vast knowledge of spells. Her thirst for knowledge and competitiveness would make her a formidable opponent in a dueling championship. And then there's Viktor Krum. He is already a well - known and skilled wizard from Durmstrang, with his own unique style of magic that could pose a serious challenge.
A new Akatsuki member, a young and powerful ninja who has a personal vendetta against Naruto. Their clashes could add a lot of drama and action to the fanfic.
In a 'henceforward rwby fanfic', a new character could be a young boy from a nomadic tribe in Remnant. His semblance is the ability to sense danger from miles away, which has kept his tribe safe for generations. He could join the RWBY gang on their adventures, bringing with him a different perspective on the world. Another potential character is a female knight from an ancient order in Atlas. She has a very strict code of honor and her semblance is the ability to make her armor impenetrable for a short period. Also, a character from a hidden underground city in Remnant could be introduced. This character has a semblance that allows them to phase through solid objects and could provide some interesting plot twists in the fanfic.
A nomadic vampire with a completely different set of values compared to the Cullens. He could be more in tune with his animalistic side and not believe in the Cullens' way of trying to blend in with humans. His presence could cause conflict within the vampire community in Forks and also attract the attention of the werewolves.
One possibility is a young girl who has the ability to control light in a way different from Ruby's speed. She could be a street urchin who has been surviving on her own in the slums of a major city in Remnant. When she meets the RWBY team, she initially distrusts them but eventually becomes an important part of their group. Also, a grizzled old veteran of many battles against Grimm could be added. He could be a mentor figure, teaching the RWBY characters new combat techniques and sharing his wisdom about the history of Remnant and the Grimm.
There could also be a group of street - smart kids who befriend the Baudelaires. They have their own set of skills and stories, and together they can form a sort of alliance to protect their neighborhood from any potential threats. These new characters would bring in fresh perspectives and interactions for the existing characters in the fanfic.
You could add a young and inexperienced vault hunter who is eager to make a name for themselves. They might start off as a bit of a nuisance to the more experienced characters but gradually prove their worth. There could also be a mysterious merchant who is not what they seem. They might have a hidden agenda and be involved in some sort of illegal trading that could have a big impact on the Borderlands economy.