One of the themes could be the struggle for survival. Characters might have to deal with hostile environments or unknown threats. Also, themes of discovery and self-discovery are quite popular in me andromeda fanfics.
One common theme is mentorship. Andromeda, being an older and more experienced witch, often takes on a mentoring role to Harry. For example, in many fanfics, she helps him understand the complex politics of the wizarding world.
The themes of healing and growth are quite common. Harry has been through a lot of trauma, and Andromeda, with her own experiences, can help him heal. Their relationship can be a catalyst for both of their personal growth. Also, the theme of acceptance is there. Harry is often an outsider in some ways, and Andromeda, being from a different part of the wizarding society, can offer him acceptance and understanding.
One common theme is family. Given Andromeda's break from her pure - blood family to marry Ted Tonks, a Muggle - born, family dynamics are often explored. Another theme is loyalty. Whether it's her loyalty to her new family or her struggle with the loyalty she once had to her Black family. Also, the theme of identity is prevalent. She has to define herself apart from her family's dark reputation.
One common theme could be adventure. Writers might take Andromeda Harper on exciting quests or missions. Another theme could be friendship. They might explore the relationships she has with other characters in the story. Romance can also be a common theme, perhaps with other characters in her fictional world.
A common plotline is Hermione getting injured during a battle or a dangerous adventure. For example, in many fanfics, she might be hurt while exploring an old, dark wizard's lair. Another is getting injured by a magical experiment gone wrong, like in some stories where she's trying a new, untested spell.
One great 'Harry raised by Andromeda' fanfic could be 'A New Beginning'. In it, Andromeda raises Harry with all the love and care he missed. It shows how Harry grows up in a more stable environment and how his personality develops differently. He becomes more confident and less self - doubting. Another fanfic might be 'The Andromeda Influence' where Harry learns a great deal about the wizarding world from Andromeda's unique perspective as a Black family member who has broken away from their dark traditions.
Family is a big theme. It explores how Andromeda, as a relative of Harry, can provide a different kind of family environment compared to the Dursleys. It shows the importance of a loving and magical family in Harry's growth.
Conflict, both internal and external, is also a frequent theme. It could be conflict between different species, or internal struggles within the crew. For example, moral dilemmas are often explored, like whether to interfere with the development of a primitive civilization or not. And of course, the theme of friendship and teamwork is also prevalent. The characters on the Andromeda rely on each other to overcome challenges.
One common theme is adventure. Since Percy is known for his adventures in his original series, when combined with the vastness of Andromeda, it makes for great adventure stories. Another is the discovery of new powers or abilities. Percy might discover new powers related to the Andromeda environment.
Friendship is also a big theme. The relationships between Harry, Amelia and Andromeda are usually depicted in a way that shows how they support each other through difficult times in the wizarding world. They might be facing dark wizards or difficult magical tasks together, and their friendship is what keeps them going.