Nico di Angelo is also quite popular. His dark and brooding nature makes him an interesting character to write about. Fanfictions might explore his past more, or his powers and how he uses them in new situations. He could be the focus of a story where he has to save the day in a way that's different from Percy.
Percy Jackson himself is still very popular. People love to write about his further adventures, his growth as a demigod, and his relationships. For example, his relationship with Annabeth might be explored in more depth, like how they deal with new challenges as a couple.
Obviously, Percy Jackson himself is a main character. As an alpha in these fanfictions, he often has new characteristics and powers. Annabeth Chase is also likely to be a main character. She's usually by Percy's side, using her wisdom to help him in his alpha - led adventures. Grover might also be there, providing his unique support as Percy's best friend and a satyr.
A really popular 'Percy Jackson Alpha Werewolf' fanfic is 'Alpha's Destiny Among Demigods'. In this story, an alpha werewolf is drawn into the world of Percy Jackson by a prophecy. The plot is engaging as it shows the werewolf trying to find his place among the demigods, with lots of action - packed scenes and some great character development along the way.
Percy himself is of course a very popular character in this type of fanfiction. Since it's about his journey in the past, he's the central figure. Another popular character is Annabeth. Fans often write about her either accompanying Percy in his time - traveling adventures or being the one waiting for him back in the present while he's in the past. And then there are the gods. Zeus, Poseidon and Athena are often included as they play important roles in Percy's past - related stories.
Percy Jackson himself is often a central character in these fanfictions. His powers and his journey as a demigod make him a natural focus. Annabeth Chase is also popular as she brings her intelligence and strategic thinking to the stories. Grover could be another popular character, especially if the fanfiction involves exploring new areas in Canada, as his nature - related abilities can come in handy.
Grover often appears in fanfiction as well. His loyalty to Percy and his own unique abilities as a satyr can be used in really interesting ways. For example, a story could revolve around Grover's search for a new type of magical plant that could save Percy from a deadly curse.
Obviously, Percy Jackson is a very popular character in this type of fanfiction as the concept often revolves around her in a futa form. Annabeth Chase is also popular as she is Percy's main love interest in the original series, and in the fanfiction, their relationship can be explored in new and different ways.
Percy himself is obviously very popular. After all, it's his series. Annabeth is also a fan favorite, as her intelligence and strong will make for interesting storylines. Nico di Angelo is quite popular too, especially when his powers and his somewhat dark nature are explored in fanfiction.
Annabeth Chase is also a favorite. Her strategic mind makes her a key player in the capture the flag scenarios. She can come up with brilliant plans to outmaneuver the other teams, like setting up elaborate traps or diversionary tactics.
Percy Jackson himself is of course very popular. His friends like Annabeth Chase also often appear. Grover could be there too, still being Percy's loyal friend. New characters might include college professors who turn out to have some connection to the world of mythology, like a history professor who is secretly a descendant of a minor god.
A third one could be 'The Alpha Percy's Alliance'. In this fanfiction, Percy as an alpha forms an unexpected alliance with some of the minor gods. Since he's an alpha, he has a different kind of charisma and strength that makes these minor gods trust him more. They work together to combat a common enemy that is threatening both the mortal and the divine world.