One interesting plotline could be Harry discovering his animagus form earlier than in the original series and using it to secretly explore Hogwarts at night. He might find hidden passages or secrets that were previously unknown.
In this fanfiction, a possible plotline could be that Harry's animagus form is a wolf. This causes some confusion and suspicion among the Hogwarts community as they initially mistake him for a werewolf. Harry then has to prove that he is in control of his form and use it to his advantage, such as using his enhanced senses to detect dark magic or the presence of Death Eaters.
Perhaps there's a plot where Harry's animagus form is something very unexpected, like a phoenix. This could lead to him having special powers or a connection to Dumbledore that he didn't have before. He could use these new abilities to fight against Voldemort in unique ways, for example, using the phoenix's ability to heal to help the injured during battles.
Well, perhaps in the fanfiction, Harry becomes an Animagus to better spy on the Death Eaters. His form could be a small, inconspicuous animal like a mouse or a sparrow. He uses this ability to sneak into their meetings and gather crucial information for the Order of the Phoenix. It could also lead to some humorous situations, like when Hermione almost steps on him not realizing it's Harry in his Animagus form.
One interesting plotline could be Harry's discovery of his animagus form in a unique way. Maybe he doesn't follow the traditional path of learning in Hogwarts but instead has some sort of accidental transformation that leads him to explore his new ability.
A plotline could involve Harry using his Jaguar Animagus form to explore hidden parts of Hogwarts. He might find secret passages or rooms that are only accessible in his animal form. For example, there could be a hidden chamber beneath the Quidditch pitch that he discovers while prowling as a jaguar.
Well, in some 'harry as an animagus fanfiction', there could be a plot where Harry's animagus form is a unique animal that has special powers. For example, if he's a phoenix - like animagus, he could have the power of regeneration. This would add a whole new dimension to his battles against Voldemort. He could use his phoenix - like abilities to heal his friends and come back from near - death experiences.
One possible plotline could be Harry's struggle with the transformation process. He might face difficulties in controlling his animagus form at first, leading to some comical or dangerous situations. For example, accidentally transforming in the middle of a class.
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.
One interesting aspect could be seeing Harry's new form as an Animagus. Maybe he turns into a unique animal that gives him different abilities and perspectives in the wizarding world.
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.
One interesting idea could be a character who was always thought to be a normal human but is actually a reverse animagus, meaning they turn into a human from an animal form instead of the other way around. For example, a cat that can transform into a wizard. It adds a whole new layer of mystery and backstory to the character.
One interesting aspect could be seeing Harry Potter transform into different animals in new and creative ways. It might also explore how his relationships change due to this new ability.