Obviously, the three Charmed Ones sisters. One might be strong in telekinesis, another in premonitions, and the third in something else like time - related magic. And then there are often supporting characters like their love interests, friends who might be witches or warlocks too, and of course, the villains they face. These characters all interact to create the complex world of the novels.
Well, the Charmed Ones themselves - Prue, Piper, and Phoebe are obvious characters. Then, there could be various male or female characters from the magical community. For instance, Leo could be part of the harem as he has a strong connection to Piper. There might also be new characters created specifically for the fanfic, like a powerful witch from another coven or a magical being with a unique power.
In the Charmed Ones novels, family heritage is an important theme. Their magical abilities are part of their family legacy. They also explore the theme of love. Love not only in the romantic sense but also love for their family and friends, which gives them the strength to face various challenges in their magical lives.
Well, obviously Julian is a main character. He's often the center of the story, with his own journey and development. Then there are the Charmed Ones, usually Piper, Phoebe, and Paige. Their interactions with Julian are what drive a lot of the plot. They might be helping him control his powers, or he could be helping them in their fight against demons.
I don't know specifically as it's a fanfic. But they could be new characters created by the author, or it could be centered around some of the well - known characters from the 'Charmed' series, perhaps four witches.
Obviously, Phoebe's daughter would be a main character. She would likely have her own personality, powers, and goals. Phoebe herself would probably also be a major character, perhaps as a mentor or a source of conflict depending on the story.
Often, in such fanfiction, new original characters are introduced. They could be the ones who created the charmed lemon in the first place. But it's also possible that characters like Dumbledore could play a significant role. He might know more about the charmed lemon than he lets on and be guiding the other characters from behind the scenes. Neville could also be a main character, using his skills with plants to take care of the charmed lemon or study it.
Definitely characters from both 'Charmed' and 'Harry Potter'. From 'Harry Potter', Harry, Hermione, and Ron are very likely to be main characters as they are the central figures in the original series. In 'Charmed', the Halliwell sisters, Prue, Piper, and Phoebe, would be prime candidates. Their different powers and personalities would create interesting dynamics when interacting with the 'Harry Potter' characters.
There could also be other characters from the Harry Potter universe like Hermione and Ron. They might be involved in helping Harry navigate this new world of being connected to the Charmed Ones. And from the Charmed side, there could be Leo, their Whitelighter, who might have some interesting interactions with the magical folk from Harry's world.
Most likely, Chris would be one of the main characters. Given his significance in the 'Charmed' universe, he would play a key role. Also, the main archer from 'Archer' would probably be a main character as well, since it's a 'crossed' fanfic.
Based on the title, it seems that Chris and his cousins would be the main characters. But without more information, it's hard to say exactly which cousins are involved or if there are other important supporting characters.