She could fit in by being a transfer student of sorts. Her different magical background from Hogwarts would set her apart. Her knowledge of potions, for instance, might be different and more advanced in some ways compared to what they have in Highschool DxD. Also, her experience with fighting dark wizards in the Harry Potter world could make her a valuable asset in the battles against the devils and other threats in the Highschool DxD universe. She might also form alliances with different factions based on her skills and values.
In fanfiction, Fem Harry Potter might fit into the Highschool DxD universe through her connection to magic. Since both worlds have magic, she could find ways to bridge the gap between the two. Her magic could interact with the sacred gears in Highschool DxD in unexpected ways. For example, her magic might enhance or disrupt the powers of the sacred gears. She could also introduce new concepts of magic like the four houses at Hogwarts, which could influence the way the characters in Highschool DxD think about groups and loyalties.
The best chapter pointer here is Chapter 208, "Those Who Commit Many Wrongs Will Destroy Themselves". It opens with Jiang Yan clicked his tongue, "What's this about money? and closes on Seemingly sensing the raging fire in Su Yinwan's heart and feeling....
Chapter 257 is the strongest chapter-level answer because it starts from This nation seemed to have a particular love for bright colors. and follows through on Yet in the end, not only did she have no sense of guilt, she even forgot....
If you want the clearest chapter reference, go to Chapter 250. Early on, The knowledge that several guests were soon returning had fans arriving at...; later, the chapter leans on Among them, Su Yinwan's fans were the craziest..
Chapter 197 is the strongest chapter-level answer because it starts from Seeing that no one cared about what she said, Su Yinwan immediately felt... and follows through on Wen Jiaojiao, aren't you underestimating me?.
The best chapter pointer here is Chapter 234, "Chasing Wind Youth". It opens with Given the vast mystical powers Jiang Li had displayed before, he was... and closes on His voice, intermittent and broken, came through the earpiece: "Sorry, my....
If you want the clearest chapter reference, go to Chapter 217. Early on, But Director Sun didn't plan to give her any room to think, he directly...; later, the chapter leans on Deduct them if you must, her total score was already far ahead of everyone....
The best chapter pointer here is Chapter 246, "Betting He Can't Last Even One Second". It opens with At that moment, not only Su Yinwan but also Shang Shaojing's complexion... and closes on Your phones have also been placed at each of your seats, you can check....
Look to Chapter 250 for the clearest answer. It begins with The knowledge that several guests were soon returning had fans arriving at..., keeps building through Among them, Su Yinwan's fans were the craziest., and lands on It should be at the top right now." Hearing this, Su Yinwan finally had.
Look to Chapter 205 for the clearest answer. It begins with Ah Fu had no idea what the video Jiang Li mentioned was., keeps building through He had been smugly thinking that the older sister was merely trying to..., and lands on Having such a sister certainly would bring happiness..
A practical answer is Chapter 218, because it turns the idea into a concrete scene. The chapter opens with However, what surprised the guests even more was that the harvest Director..., adds pressure through I quite like them." Qi Tianyu: ?, and ends on Thinking about this, Jiang Yan started to.