Harry Potter, of course. Then there could be a young witch from Goa who has been training under the Uld Host. Her name could be Maya. She has unique magical abilities that are different from what Harry is used to. Neville could also be a main character in this fanfiction. He might be interested in the new types of plants and magical herbs that are found in Goa and related to the Uld Host's magic. And there could be a mysterious figure known as the Keeper of the Uld, who is an enigma and whose actions drive much of the story.
Obviously, Harry Potter would be one of the main characters. Hermione and Ron would likely be by his side as well. But there could also be new characters specific to the Goa Uld Host. Maybe a local wizard named Arjun who has a deep connection to the Goa Uld Host and acts as a guide for Harry and his friends. Another could be an elder of the Uld, a wise and powerful figure named Zara who has knowledge about the history of the host and the magic involved.
Obviously, Harry Potter himself could be a main character. He could be drawn to Goa Uld because of some mysterious happenings that seem to be related to Voldemort or some other dark force.
One possible plot could be that in Goa, there is a hidden magical community. The Uld (assuming it's some sort of magical entity or group) could be hosting an event. Harry Potter and his friends arrive there and discover a new kind of magic that is unique to this place. They might have to face challenges related to local magic traditions and make new allies among the Goa wizards.
A plot could involve a Goa'uld escaping from its own realm and finding its way into the wizarding world. It chooses a random Harry Potter character as a host. The Goa'uld starts to use the character's knowledge of magic and the wizarding world to its advantage, trying to build its own little empire within Hogwarts. However, the magical nature of the wizarding world has some unforeseen effects on the Goa'uld, and the character's original personality starts to fight back against the Goa'uld's control. This internal struggle and the external attempts to stop the Goa'uld make for an interesting fanfiction story.
Well, the Goa'uld might initially be confused by the magic. They are used to their own technology and forms of power. Magic could be a new and difficult - to - understand concept for them. For example, if the Goa'uld tries to use its usual mind - control techniques, the magic in the wizarding world might resist it. Spells could be used to detect the presence of the Goa'uld in a host. And if the Goa'uld tries to fight back using its own powers, the magical shields and defenses in the wizarding world could prove to be a challenge.
In this type of fanfiction, the interaction could be based on mutual interests. Maybe some Goa'uld are interested in the Philosopher's Stone for its potential to grant immortality. So they might try to make deals with the wizards. However, the wizards would be very cautious as they know the Goa'uld's reputation for being manipulative. This would lead to a lot of tense negotiations and possible betrayals.
A powerful dark wizard from Goa Uld's world could be the main antagonist. He could be jealous of the chakra power in Naruto's world and want to steal it for his own evil purposes. He might start by creating chaos in the shinobi villages to weaken them before making his big move.
One plotline could be that the goa'uld symbiants are discovered in the Forbidden Forest. Harry and his friends, out of curiosity, start to investigate. As they learn more about the symbiants, they find out that there is a prophecy that links the fate of the wizarding world with the goa'uld. Harry then has to figure out how to prevent a catastrophe that would occur if the wrong goa'uld gets too much power in the wizarding world. This could involve traveling to different magical and goa'uld - related places, making new allies and enemies, and using both his magical skills and the new knowledge about the symbiants to save the day.
Probably Anubis. He was extremely powerful among the Goa'uld. In a Harry Potter crossover, his ability to manipulate dark forces could be enhanced by the dark magic in the Harry Potter universe. He might be able to use spells like the Unforgivable Curses to his advantage and combine them with his Goa'uld powers.
In Goa'uld Harry Potter fanfiction, there could be a concept where the Goa'uld symbiotes possess magical creatures in the Harry Potter world. Imagine a Goa'uld in a hippogriff or a dragon. This would not only change the nature of those creatures but also create a whole new set of challenges for the characters in the story. The Goa'uld's hierarchical society might also clash with the relatively egalitarian society of the wizards, leading to all sorts of power struggles and political intrigue.
One idea could be a story where Goa Uld is a new magical creature discovered in the Forbidden Forest at Hogwarts. The main characters, like Harry, Hermione, and Ron, have to figure out how to deal with it. Maybe it has some unique powers that can either help or endanger the wizarding world.