Maybe Ron Weasley. Imagine a fanfiction where Ron, after getting married, has triplets. Given his humorous and sometimes clumsy nature, it would be really fun to see how he and his wife deal with three little ones. He could pass on his love for food and his loyalty to his children in a really endearing way.
In some fanfictions, it could be Sirius Black. Some fans like to imagine that Sirius had a deeper connection to James Potter's family than just being best friends. They might create a scenario where there was some sort of magic or prophecy involved that made Sirius more than just Harry's godfather, but his actual father in this alternate story line.
It could be Sirius Black. Maybe there was some misinformation that made Harry believe Sirius was his father for a while, but then it turns out he isn't. After all, Sirius was very close to Harry and had a father - like relationship with him in some ways.
Yes, there are likely fanfictions out there with the concept of the 'father of vampires' in the Harry Potter universe. Fanfiction writers often come up with creative and unique ideas that blend different elements of the HP world. You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own to find such stories.
In some fanfictions, Snape is indeed portrayed as Harry Potter's father. Fanfiction allows for creative reinterpretations of the original story, and this is one such interesting deviation from the canon where Snape's complex relationship with Harry takes on a whole new dimension.
I'm not sure if there is such a specific fanfiction. There are countless fanfictions out there, and while some might come up with really wild and creative ideas like this, it's not a common or well - known one that I'm immediately aware of.
One popular 'father figure' Harry Potter fanfic is 'A Father's Love'. It shows a character taking on a father - like role for Harry in a really heartwarming way. Another one could be 'The Mentor's Role' where an older wizard acts as a father figure to guide Harry through his challenges at Hogwarts.
There are many fanfics that might explore Snape as a father figure. Some could focus on how he protects Harry from behind the scenes. For example, he could be the one leaving anonymous hints for Harry to solve problems, just like a father would subtly guide his child. It gives a whole new perspective to Snape's character.
One possible scenario in a fanfiction of Harry Potter's father and a Murkrow could be that the Murkrow is actually a transformed Animagus. James Potter might initially be suspicious of it but then realize it's an ally in some sort of secret mission against the Dark Arts. Since James was part of the Marauders, he was always into adventures, and this could be one such adventure involving a strange creature like the Murkrow.
In some fanfictions, Sirius Black can be depicted as Harry Potter's father. Fanfiction often takes creative liberties with the original story, so it's not uncommon to see such radical changes in character relationships for the sake of exploring new storylines or emotional arcs.