A basilisk might be an unusual familiar in Harry Potter fanfiction. Since basilisks are extremely dangerous and rare in the original story. If a character in fanfiction had a basilisk as a familiar, it would completely change the power dynamics. The character would have to deal with the basilisk's deadly gaze and the fact that it's a dark and feared creature, but also harness its power for good or evil depending on the nature of the story.
One example could be a phoenix. In regular Harry Potter lore, only Dumbledore has a phoenix as a familiar. But in fanfiction, a character like Harry could have a phoenix as his unusual familiar. It could be a sign of his special connection to magic and his destiny, as phoenixes are symbols of rebirth and great power.
I'm not sure specifically as there are many different fanfictions with this title. It could be about Harry Potter having a very strange or unexpected magical creature as his familiar, perhaps a creature from a different magical realm or one with unique powers.
In this fanfiction, Harry Potter is the central figure. His unusual familiar, which could be a creature that has never been seen in the wizarding world before, is also a main character. Additionally, the professors at Hogwarts, such as Dumbledore or Snape, could play important roles. Dumbledore might offer his wisdom regarding the familiar, while Snape could be initially distrustful. And of course, Harry's friends, they could be there to support him, offer advice, or get into some comical situations because of the unfamiliar nature of this new familiar.
If the familiar is something like a dragon, it could greatly impact the plot. Dragons are powerful and feared. The character with the dragon familiar might be constantly hunted by those who want to use the dragon for their own purposes or those who fear its power. This would create a lot of conflict and drive the story forward as the character has to protect their dragon and themselves.
Well, it could be a guide. Maybe the dog knows secret passages in Hogwarts that Harry is unaware of. The dog could lead Harry to these places, which might hold important clues or magical items. Also, the dog could be a friend in a more tactile way than Hedwig. Harry could play with it and it could provide emotional support during tough times at Hogwarts, like when he's facing difficulties with exams or dealing with bullies.
Well, perhaps Harry discovers a magical creature in the Forbidden Forest that becomes his familiar. It could be a small dragon-like creature that only he can communicate with, and it helps him find hidden secrets in Hogwarts.
Well, perhaps the plot could involve Harry finding a dragon egg and raising the dragon as his familiar. This would bring a whole new set of adventures as he has to hide the dragon from the Hogwarts faculty who might not be too keen on a dragon on campus. He could also use the dragon's special abilities to his advantage in his battles against Voldemort.
In theory, it could be an interesting concept in fanfiction. However, it would be extremely out of the ordinary considering the nature of Xenomorphs. They are highly dangerous and aggressive creatures from the Alien franchise, which is very different from the magical world of Harry Potter where familiars are usually more docile and magical in nature. But in the creative realm of fanfiction, the author could come up with some sort of magical binding or control to make it work.
Well, one ability could be enhanced speed. Pegasus are already very fast, but in the fanfiction, Harry's pegasus might be able to travel at near - instantaneous speeds. This would be useful for getting Harry out of dangerous situations quickly or for delivering urgent messages across long distances in the wizarding world.
Well, perhaps in the fanfiction, Harry's unusual pet was a gift from a mysterious wizard who had been observing him. This pet could have the power to turn invisible at will, which would be really useful for Harry during his adventures at Hogwarts. It might be a small, furry creature with big, intelligent eyes that could communicate with Harry in a special way.
Well, perhaps the succubus could initially be a mystery to Harry. She might seem like an ordinary creature at first, but then he discovers her true nature. Maybe she helps him in some unexpected ways in his battles against Voldemort, like using her unique powers to distract the Death Eaters.