One theme could be their cooperation in the Order of the Phoenix. They both were part of the organization fighting against Voldemort, and a fanfic could focus on their strategic planning and how they supported each other during dangerous missions.
A good theme might be Tonks's influence on Harry's view of the wizarding world outside of Hogwarts. Since Tonks had a more diverse experience in the wizarding community, she could introduce Harry to different aspects of magic and wizarding culture, which would make for an interesting fanfic.
Another theme could be their friendship based on mutual respect for each other's abilities. Harry was known for his courage and his connection to Voldemort, while Tonks had her shape - shifting abilities. A fanfic exploring how they admired and learned from each other would be great. It could show them training together, sharing stories of their past experiences, and building a strong bond as comrades in the fight against the dark side.
Chapter 706, "How Did a Good Person Turn Out Like This?", is the clearest early answer because it turns Good Person Turn's situation into a concrete plot event. The chapter turns that into something concrete by moving from Inside the building, President Sun and his group watched Zhao Lang...
Chapter 444, "Wait and See", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Carrying a backpack, Yu Li walked for over ten minutes but ultimately...
Chapter 391, "Has another top celebrity had a scandal?", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. The chapter turns that into something concrete by moving from You were born in a rural area, not exactly poor, but not particularly...
Chapter 326, "Jiang Mingyu Stranded in a Foreign Land", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. The chapter gives readers a real answer by opening on And at this moment, on the other end of the Earth.
Chapter 629, "The Family is Going to be Gone", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event. Early on, Even after training under Jiang Li for so long, they couldn't.... By the end, You aren't the one injured!" He had had enough of this island!.
Chapter 671, "Who Understands Family!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Director Meng drove the shuttle bus around Jingcheng Airport.
Chapter 317, "You Can't Afford to Mess with the Person Behind Her!", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with He Pingzhang gazed at the man curled up before him, unable to...
Chapter 320, "How is She Here Too?!", is the clearest early answer because it turns Xiao Xueyi's situation into a concrete plot event. The chapter gives readers a real answer by opening on Although she thought this way, Su Yinwan still knew the importance of...
Chapter 405, "The Person Saved Casually Turns Out to Be a Diplomat?!", is the clearest early answer because it turns Hua Country's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The medical student was completely dumbfounded.
Chapter 345, "Audition: She Couldn't Have Gotten in Through Backdoor Connections, Could She?", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event.