There might also be original characters created specifically for the fanfic. Maybe a mentor figure who has knowledge of both Sky's world and the wizarding world, guiding them on their journey. Or an antagonist who is envious of the bond between Harry and Sky and tries to break it apart to gain power for himself.
Obviously, Harry Potter is one of the main characters. He brings his knowledge of the wizarding world, his Gryffindor courage, and his skills in magic like spells and potions. Sky Arcoblano is the other key character. He has his own set of characteristics which could include unique powers or a different cultural background from his own world that adds an interesting element to the story.
In addition to Harry and Sky Arcoblano, there could be other important characters. For instance, Hermione Granger might play a role. Her intelligence and vast knowledge of magic could be crucial in helping Harry and Sky in their adventures. Ron Weasley too could be there, with his loyalty and his own brand of humor, providing support and comic relief in the story.
One interesting Sky Arcoblano Harry fanfic could be about Sky Arcoblano joining Harry at Hogwarts and they embark on a quest to find a hidden magical artifact. Sky's unique abilities might help them in unexpected ways, like using his skills to navigate through dangerous enchanted mazes.
Since I don't know the specific 'black sky fanfic', I can't say who the main characters are. They could be original characters created by the fanfic author, or they might be characters from an existing franchise that the fanfic is based on.
I'm not sure specifically as I haven't read it. But they could be astronauts, space explorers, or even beings from other planets. Maybe there's a brave captain leading a crew on a journey through the cosmic sky.
There could also be antagonists in the fanfic. For example, the Trix, a group of witches who are always causing trouble for Bloom and her friends. They could be the main source of conflict in the story, constantly trying to thwart Bloom Sky's plans and steal their powers.
The celestial sky dragon itself is surely one of the main characters. There may also be some other important characters like a wizard or a fairy who might interact with the dragon in different ways.
Naruto would surely be one of the main characters. He could be the one who bridges the gap between the regular ninja world and the sky ninja. Sasuke might also be involved, perhaps having some sort of rivalry with a sky ninja who has similar power levels. Sakura could play a role in healing the injured during the interactions between the two groups.
Based on the title, it seems that Bloom and Sky are the main characters. They are likely the ones involved in the kiss and around whom the fanfic's story revolves.
In 'Harry and Teddy fanfic', the two main characters are Harry and Teddy. Harry is the one who has been through so much in the wizarding world. He has a sense of responsibility towards Teddy. Teddy is a character full of possibilities. He's the product of a tragic event (his parents' death), and Harry's presence in his life is like a guiding light. Their personalities, Harry's wisdom and Teddy's eagerness to learn, are often explored in these fanfics, which makes for very engaging stories.
In some fanfics, there could be magical animals other than crows. For instance, a wise old owl that serves as a mentor to Harry. The owl could give Harry advice on how to deal with various situations, such as when he is facing a difficult choice or when he is in danger. These additional characters add more depth and variety to the fanfic stories.
Then there might be some souls that Harry has a special connection with. These souls could be recurring characters, each with their own backstory and personality, and their interactions with Harry would drive the story forward in different ways.