In what way does the Rani raise Harry Potter in fanfiction?

He probably uses his magic in a discreet way. For example, he could use a charm to make Teddy's toys more interesting. And he would rely on his own experiences of growing up without parents to give Teddy a loving and stable environment.

Not usually. The Rani is a character from Doctor Who and doesn't commonly crossover into Harry Potter fanfiction.

It could be that the assassin was initially a victim of some dark wizard's experiment. Harry, being the hero he is, feels responsible for the child and decides to raise him. In the process of raising, he unknowingly nurtures the assassin-like qualities in the child because of the unique circumstances and challenges they face together.

In some fanfictions, Harry Potter and Andromeda Tonks might discuss political matters related to wizarding society's governance and reforms.

Well, in such fanfiction, it could be that Harry gains some extraordinary power or discovers a hidden magic that grants him immortality while everyone else around him fades away.

One possible fanfic could be 'Lily's Love and Care' where Lily raises Harry in a world without Voldemort's threat.

In this fanfic, a magical spell or transformation event causes Harry Potter to turn into a girl. It could be a result of a curse or a unique magical experiment gone awry.

Tony Stark would likely raise Harry Potter with a focus on intelligence and innovation. He'd encourage Harry to think outside the box when it comes to magic. Maybe he'd set up a lab for Harry to experiment with magic and technology combinations.

Tony would raise Harry with a focus on intelligence and self - reliance. He'd encourage Harry to study hard, not just in school but also in understanding the world around him. Harry would be trained in physical combat and how to use technology to his advantage.

One possibility could be centaurs. Centaurs are intelligent and have their own code of ethics. They could raise Harry with a deep understanding of nature and the stars, which would give him a different kind of wisdom.