What kind of fanfiction can be created combining Harry Potter, a magician, and Doctor Who?

Well, you could have a story where Harry Potter travels through time and space with the Doctor to magical worlds and has adventures.

Another possibility is a story in which a young wizard in the Harry Potter world discovers a hidden portal that leads to the dimension where Doctor Strange operates. This wizard, inspired by Strange, begins to study a new form of magic that combines the principles of both universes. They then return to Hogwarts and start to teach their friends this new hybrid magic, which causes quite a stir among the faculty and students alike.

There are all sorts of fanfics out there. Some might have the Doctor visiting the wizarding world of Harry Potter, while others could bring Harry and his friends into the Doctor's time-traveling adventures.

Maybe a fanfiction where the Strawhats Pirates discover a magical portal and end up in the wizarding world of Harry Potter. They could team up to solve some magical mystery.

Well, some fanfictions could have Harry Potter using his death powers to assist the Doctor in defeating powerful foes. Or maybe they team up to save different timelines. It really depends on the creativity of the authors!

Well, you could imagine a time-travel adventure where Sirius and James get pulled into the Doctor Who universe and have to face off against some alien threats.

Maybe it's a story where the main character has to count to four to activate a magical portal that leads from the Harry Potter universe to the Doctor Who universe.

One idea could be a crossover where Doctor Strange uses his magic to visit the wizarding world of Harry Potter. He could meet Harry and help him with some of his more difficult magical problems, like dealing with a particularly powerful dark magic spell that the Hogwarts professors are stumped by.

There are all sorts of fanfictions. Some might focus on crossovers where characters from both universes meet and interact. Others could explore alternate timelines or what-if scenarios.

It's possible. Sometimes fans come up with creative crossover ideas. But it could take some digging through various online platforms dedicated to fanfiction to find good ones.