One potential character could be a new sidekick for Batgirl Beyond. Maybe a young girl who idolizes Batgirl and has some unique skills like acrobatics or martial arts training. She could bring a fresh dynamic to the story and help Batgirl in her missions.
A new villain character could be introduced. A mysterious figure with a complex backstory and motives. For example, a scientist who was wronged in the past and now uses their knowledge for evil, creating dangerous experiments that Batgirl Beyond has to stop.
One potential character could be a wise old hermit who lives in a secluded part of the paradise. He could offer Percy valuable advice and knowledge about the secrets of the paradise.
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.
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.
An old - fashioned Pokemon breeder who has a deep connection with the traditional ways of raising Pokemon. They could provide the main characters with valuable advice on how to make their Pokemon stronger and healthier. However, they might also be a bit stubborn about sticking to the old ways and this could cause some conflicts with the more modern - thinking characters in the fanfic.
One potential character is a young wizard named Merlin Jr. He's still learning his magic but is always eager to show off to Luna. There could also be a group of forest sprites. They're mischievous but friendly, and they often play pranks on Luna which she takes in good humor. Additionally, a gentle giant named Giganto who lives on the outskirts of the kingdom. He helps Luna when she needs to move big things, like a fallen tree that's blocking a path in the forest.
One potential character could be a rogue alien scientist who is interested in Big Chill's biology. Another could be a young alien apprentice who looks up to Big Chill. And a third could be an ancient alien guardian who has knowledge about Big Chill's species' history.
A centaur who has knowledge of ancient prophecies involving both Percy and Artemis could be added. The centaur could act as a guide or a mentor to them during their adventure. He could provide crucial information about the enemies they are facing and how to use their combined powers effectively. For example, he might know of a weakness in a powerful foe that only Percy's unique abilities and Artemis' lunar powers can exploit.
A young mage who has the power to communicate with all types of magical creatures, not just dragons. This mage could be a valuable ally or a source of trouble for the existing characters in the fanfic.
A young apprentice who has just started working in the chocolate factory. He is eager to learn from Willy Wonka but often makes mistakes that lead to humorous situations. For example, he accidentally mixes up the ingredients for a very important chocolate and creates a new, strange - tasting but oddly popular chocolate.