Would everything be different if Harry Potter had a twin sister who looked exactly like Lily? (Okay, I know this is a joke that many people have already written, but I still want to write it. There shouldn't be too many cool things, probably...)
When Linda Potter was eleven years old, she and her brother received a letter of admission to Hogwarts, thus starting her exploration in the magical world.
Unlike her savior brother, she seems to be so ordinary, studying and taking exams (maybe even falling in love?). She is not as brave as her brother, but she also has beautiful memories of Hogwarts.
Some random thoughts:
The heroine is Harry's sister, but she doesn't participate much in the main plot and is at best a bystander.
The CP is undecided, it may be Gemini or Seid. The professor won't give her extra points like crazy because she looks like Lily. At most, he will try not to deduct points for her and will give her extra points for her good performance (after all, except for the Snake House, it's hard to get extra points from the professor, right?). The two of them are probably a family line.
If there's anything else I can add, I'll tell you in my speech.
Purpose: To make up for the regrets in life