There could be a fanfiction where Harry Potter's Animagus form is a phoenix. When approaching Cerberus, the phoenix's natural magic and allure might have an unexpected effect on the fearsome beast. The phoenix is a symbol of rebirth and magic, and perhaps its presence could either calm Cerberus or lead to a completely different kind of encounter. Harry would have to rely on his instincts as a phoenix - Animagus to navigate this dangerous situation, and it would be a great adventure for him.
Yes, there are some out there. You can start by looking on fanfiction websites like Archive of Our Own or FanFiction.net. Search for the keywords 'Harry Potter', 'Cerberus', and 'Animagus'. Some might be really well - written with interesting takes on how Harry or another character's Animagus form interacts with Cerberus.
There are not many fanfictions on this specific topic. However, if you search on platforms like Fanfiction.net or Archive of Our Own, you might find some rare gems. You could start by using keywords like 'Harry Potter', 'Animagus', and 'Manticore' in the search bar.
One popular fanfiction concept could be a character like Hermione becoming a raven Animagus. She could use her new form to spy on Death Eaters or gather information in a more discreet way. For example, she might fly into the Forbidden Forest to study dark creatures from a safe distance without being detected.
One possible fanfiction could be where Harry discovers his ability to turn into a Black Lion Animagus during a dangerous encounter in the Forbidden Forest. He uses this form to protect his friends from a dark creature that has invaded the school grounds.
One possible scenario in such a fanfiction could be that Harry discovers his unique Animagus form of Indominus Rex during his time at Hogwarts. Maybe it's a result of some dark magic experiment gone wrong in the Forbidden Forest that alters his magical core and gives him this fearsome form. He would have to hide it from his friends and teachers at first, fearing the consequences.
A fanfiction could explore the idea that Harry Potter is a giant wolf animagus and how this affects his relationship with his friends. For example, Hermione might be both fascinated and a bit worried about this new development. Ron could be initially scared but then come to see it as another amazing aspect of Harry. The story could also involve Harry using his wolf form to communicate with other magical creatures in a way that no one else can, leading to new alliances and secrets being uncovered.
One possible scenario in such a fanfiction could be that Harry discovers his ability to turn into a snow leopard during his time at Hogwarts. Maybe he's exploring the Forbidden Forest alone one day and feels a strange connection to the wild, which then triggers his Animagus transformation. It could add a whole new layer to his character, as he has to learn to control this new form and keep it a secret from those who might not understand or might use it against him.
One great fanfiction in this vein is 'The Born Animagus Potter' on FanFiction.net. It has an interesting take on how Harry's life would be different if he was born with the Animagus ability. The story delves into his early years, showing how he might have hidden this power from the Dursleys.
I haven't read a specific fanfiction on this exact concept, but it could be really interesting. Imagine Harry Potter with the strength and stealth of a saber - tooth tiger. He could use those traits to his advantage in his battles against Voldemort. Maybe he could surprise his enemies more easily and use his new form to get into places he couldn't as a human.
One possibility could be that Harry, as a Dragon Animagus, uses his new form to his advantage in the First Task. He might be able to outmaneuver the real dragon more easily, flying around it and confusing it. This would give him an edge in retrieving the golden egg.