I'm not sure specifically as it depends on the fanfic. It could be a young wizard or witch as the main character who is drawn to the magic in the stars.
There could be a group of friends. One might be a star - gazer who first notices the strange magic in the stars and then drags their friends into the adventure. Another could be a skeptic at first but later becomes a believer and an important part of the story as they help figure out how to use the star magic.
It depends on the specific fanfiction. However, there could be a young wizard or witch who discovers their connection to the stars and becomes the central character. Maybe there's also an old sage - like figure who guides them in understanding the star - magic.
Perhaps the main character is a star - child, someone born under special circumstances related to the stars and has an innate connection to their magic. Alongside the star - child, there could be friends or protectors, like a skilled warrior who defends the star - child as they explore the full potential of the magic of the stars.
There could also be original characters created by the fanfic writer. These might be characters like a young and talented choreographer who comes in to help the stars with their routines. Or a mysterious figure who has a hidden agenda related to the outcome of the competition.
The main characters might be leaders within Harad who are trying to bring about change. Or it could be a group of outcasts who end up being the key to Harad's salvation. There could also be mysterious characters with special powers that are native to Harad.
There might be other characters who are friends or allies of the 'child of the stars'. They could be from different backgrounds, like a group of adventurers who team up with the 'child of the stars' to face various challenges. These characters would add depth and variety to the story.
There's no way to know exactly without reading it, but likely there are pirate characters. There might be a brave and fearless pirate as the protagonist, perhaps with a sidekick or a love interest. And there could be an antagonist, another pirate or a figure from the outside world who opposes the main characters' beliefs about the stars - written destiny.
I'm not sure specifically as it depends on the fanfic. But it could be an adventurous space pilot as one of the main characters.
Then there's a wise old wizard called Merlin. He guides Alex with his vast knowledge and magic skills. There is also a female character, Lily, who is strong - willed and has her own special abilities. She often comes up with creative solutions when they are in trouble.
One possible main character could be a forest - dwelling elf. Elves are often associated with archery, and in this 'arrow magic fanfic', they could have a special connection to the magic arrows. The elf might be on a quest to find the origin of the arrow magic to save their forest from a dark curse. Additionally, a human ranger who has befriended the elves could also be a main character. They would team up with the elf to explore the mysteries of the arrow magic and fight against any threats to their shared world.
Harry Potter would most likely be one of the main characters as it's in the title related to him. He would be the central figure around which the magical kaleidoscope of events unfolds.