In some fanfictions, it could be an awkward encounter. Harry might feel a bit of residual tension since he and Cho had a complicated relationship in the past. Ginny, on the other hand, might be a bit cautious, not sure how Cho will react. Maybe Cho will be polite but still have a hint of sadness seeing Harry with Ginny.
Harry might feel a mix of discomfort and nostalgia. The discomfort could come from the fact that his past relationship with Cho didn't end smoothly, and the nostalgia because there were some good memories too. Ginny could be a bit protective, feeling slightly threatened by Cho's presence as she loves Harry deeply. Cho herself might experience a twinge of pain or regret seeing Harry with Ginny.
Friendship is another theme. Stories often show how Ginny and Cho can overcome their initial rivalry and become friends. For example, they might bond over their shared experiences in the wizarding world or their mutual care for Harry in a more platonic way. This theme helps to add depth to their characters.
In this type of fanfiction, it could be that Harry has some unresolved issues from his past relationship with Cho. He sees Ginny as a distraction from dealing with those. But as time goes on, he can't ignore the pull he still feels towards Cho. He may leave Ginny when he realizes that he can't move forward in his life without exploring what could have been with Cho again.
One common theme is the struggle for self - discovery. All three characters are in a phase where they are trying to figure out who they are and what they really want in a relationship. For example, Cho is still dealing with the loss of Cedric and trying to move on, and Harry and Ginny are also growing up and changing. Also, loyalty plays a role. Harry feels a sense of loyalty towards Cho because of their shared experiences, but also has a new - found loyalty to Ginny as they get closer.
In some fanfictions, it could be a really awkward encounter. Harry might feel a bit of tension since he has a history with Cho and is now with Ginny. Ginny, on the other hand, could be a bit jealous or just curious about their past. Maybe Cho would be polite but still have some unspoken feelings for Harry.
In some fanfictions, the plot might be that Cho is jealous because Harry seems so much happier with Ginny. She starts to follow them around, not in a creepy way but more out of curiosity and envy. As she does this, she discovers things about their relationship that make her both jealous and a bit sad. For instance, she might see Harry giving Ginny a special gift that he never gave to her. This could lead to Cho having an internal struggle about her own feelings and how to move on.
Ginny would likely be heartbroken. She's a strong character but she loves Harry deeply. She might start to question herself and what she did wrong. Cho, on the other hand, would be surprised but also happy. She may have still had feelings for Harry all along. Harry himself would be conflicted at first, feeling guilty for leaving Ginny but also excited about the possibility with Cho.
Yes, there could be. Some fanfic writers might be interested in exploring alternative relationship dynamics just for the sake of creative storytelling. But it's not in line with the general perception of the characters in the official story. They may rewrite the characters' personalities a bit to make such a plot work in a non - inappropriate way.
Ginny would likely be protective. She loves Harry and knows about his difficult past with the Dursleys. So she would probably stand up for him right away, not tolerating any of their mean remarks.