He could be a griffin. A griffin combines the strength and fierceness of a lion with the intelligence and flight of an eagle. This would signify Harry's combination of courage and cleverness, which are two traits that have helped him throughout his adventures in the wizarding world.
A stag, just like his Patronus. It would be a powerful symbol of his connection to his father and his own inner strength.
A possible plotline could be that a centaur animagus uses their transformation ability to spy on dark wizards. They could turn into a raven and fly unnoticed, gathering information to protect the wizarding world and the Forbidden Forest.
Fox is also common. Foxes are seen as clever and quick - thinking animals. In fanfictions, a female character as a fox Animagus can be very alluring. They can use their fox form to outwit opponents or find hidden secrets in Hogwarts and its surroundings.
A possible plotline could be that Harry's horse Animagus form is discovered by the wrong people. For example, the Ministry of Magic might suspect him of using dark magic to achieve this form and he has to prove his innocence. This could lead to a whole adventure of him finding evidence and allies within the wizarding world to support his case.
In a 'Harry Potter is a Kitten Animagus' fanfiction, the plot could be really interesting. Harry could find that his kitten form has a connection to an ancient magic in Hogwarts. Maybe there are hidden chambers or secrets that only his kitten form can access. He might have to balance his normal life as a student and his new - found identity as a kitten Animagus. There could also be some conflicts, like the Ministry of Magic suspecting him of using his Animagus form for improper purposes, or Voldemort becoming aware of this unique ability and trying to use it against Harry or his friends.
Well, eagles have excellent vision. So an Eagle Animagus could potentially have enhanced eyesight in their human form too. They might be able to see things from great distances or notice details that others miss. Also, eagles are known for their speed and agility in flight, so in animagus form they could be very fast and maneuverable, which could be useful for things like scouting or escaping danger.
A possible plot could be that Daphne discovers she is an Animagus quite by accident. She might be in a moment of great stress or danger and suddenly transform. After that, she has to learn to control this new ability with the help of some of the Hogwarts professors, like McGonagall who is also an Animagus. This journey of self - discovery and learning control could be the main focus of the fanfiction.
A character who is a tiger Animagus in 'Harry Potter' fanfiction would likely be very stealthy. Tigers are known for their ability to move quietly in the wild, so in the fanfiction, they could use this to their advantage when sneaking around Hogwarts or spying on enemies. They might also be quite strong physically, able to overpower opponents if needed in a fight. Their senses, especially their sight and hearing, would be enhanced, which would help them detect danger or secrets more easily.
Dumbledore could be his mentor. He has vast knowledge and experience, and he would likely see the potential in Harry being an Animagus. He could guide Harry through the difficult process of learning to control his transformation and use his Animagus form for good.
Perhaps in a fanfic, Harry's phoenix Animagus form is discovered by Hermione while she is researching ancient magic. She helps him understand and control his new form. As a phoenix, Harry can access a hidden library within the Forbidden Forest, which contains knowledge that can defeat Voldemort once and for all. But he has to overcome various obstacles and traps set by dark magic to reach the heart of the library.
She could take the form of a cat. Cats are known for their stealth and curiosity in the wizarding world, which would be useful for spying. Just like how Crookshanks was able to sense things others couldn't, Fem Harry Potter as a cat could prowl around Hogwarts or other places undetected.