Yes, there are quite a few. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Some might focus on Harry's adventures as a Thunderbird Animagus, exploring new magical abilities and how it affects his relationships with other characters in the wizarding world.
A plot could involve Harry's Thunderbird Animagus form being a key to an ancient prophecy. He has to master his abilities as a Thunderbird to fulfill the prophecy and save the wizarding world from a new dark threat. Along the way, he has to deal with people's reactions to his new form, some being scared and some being in awe.
One unique aspect is the combination of the Thunderbird, which is a very unique and less - explored magical creature in the official Harry Potter lore, with the concept of Animagus. In regular Harry Potter stories, we often see common Animagus forms like cats or dogs, but a Thunderbird brings in a whole new level of magic and mystery. For example, the Thunderbird is known for its connection to the weather, so an Animagus in this form could potentially have powers related to that, like controlling storms or sensing changes in the atmosphere.
Well, I'm not sure if it's still available, but there was a fanfic titled 'My Life as a Thunderbird Animagus in Harry Potter's World'. This fanfic followed the journey of a character who was not a main character in the original books but became a very important part of the fan - created story as a Thunderbird Animagus. It had a lot of elements of self - discovery and adventure as the character tried to understand their new powers and how to use them in the context of the Hogwarts environment and the greater wizarding world.
Yes, there are quite a few. You can check out fanfiction platforms like Archive of Our Own. There you might find stories that explore Harry in the context of being a Thunderbird, with unique plotlines and character developments.
In many fanfics, Harry being a Dragon Animagus can bring about really cool storylines. For example, it could add a whole new layer of power to his character. He might be able to use the strength and abilities of a dragon in battles against Voldemort and his Death Eaters. It also could change his relationships with other characters. Some might be in awe of his new form, while others could be afraid.
Some fanfictions might feature a Thunderbird as a guide for a young wizard or witch. In this kind of story, the Thunderbird could lead the protagonist through hidden magical paths or to forgotten magical places. It could be a really immersive read as it combines the mystery of the Thunderbird with the rich tapestry of the Harry Potter universe.
I'm not sure specifically as there could be many different takes in such a fanfiction. But it might involve Harry Potter's encounter with thunderbirds in a scenario where there's a harem situation, perhaps with different relationships or adventures centered around these elements.
We can expect a lot of creativity. Since it combines two different concepts, there could be new magical abilities for Harry. For example, Thunderbirds are often associated with speed and power, so Harry might have enhanced speed in these fanfictions.
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.