Well, it could vary greatly depending on the plot of the fanfiction. One possibility is that Cho could offer some advice to Harry and Ginny based on her own experiences with Harry. Or perhaps there's a situation where they all have to work together on something, like a magical project, and they start to understand each other better. For example, Ginny might see a different side of Cho that she didn't expect, and Cho could come to respect Ginny's relationship with Harry.
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.
There are many scenarios. It could be that the meeting is a chance for Harry to finally close the chapter on his past with Cho in front of Ginny. He could make it clear that his heart belongs to Ginny now. Ginny might also show her confidence in their relationship by being friendly towards Cho. The encounter could also be a catalyst for Cho's own character development. She could realize that she needs to move on and find her own path, and this meeting with Harry and Ginny could be the push she needs in that direction.
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.
Often, Harry is in the middle, feeling a bit of discomfort. Ginny is usually the strong - willed one, showing her claim on Harry. Cho might seem a bit sad or resigned. For instance, if they meet at Hogwarts, Ginny could hold Harry's hand firmly, while Cho tries to be composed but her eyes betray her past feelings for Harry.
If Harry and Ginny meet the Marauders in fanfiction, it would be a moment full of emotions. Harry has always longed to know more about his father, and this would be his chance. The Marauders, on seeing Harry, might see a lot of James in him. Ginny would add a different dynamic to the group. She could be the voice of reason at times. Together, they could create new memories. For example, they might team up to play a prank on Snape's memory or something, which would be both funny and a way to pay homage to the Marauders' legacy.
In fanfiction, when Harry and Ginny meet the Dursleys, there could be a lot of tension. The Dursleys are not fond of anything related to magic. Ginny, being a confident witch, might stand up to the Dursleys' rudeness towards Harry. Harry, on the other hand, would be in an awkward position as he has to deal with his Muggle family and his magical girlfriend at the same time. There could be some humorous exchanges as Ginny tries to understand the strange Muggle world of the Dursleys while also showing them that magic is not something to be feared.
In fanfiction, when Harry and Ginny meet Sirius, Sirius might offer them some sage advice on dealing with the dark forces. He could share his experiences about fighting Voldemort and his Death Eaters. Maybe he would see the potential in Ginny and encourage her to further develop her magical abilities, as he has always been supportive of Harry.
One possibility is that Harry and Ginny could use a time - turning device to go back in time and meet James and Lily. They might share stories about Harry's life, and James and Lily could give their blessings to Harry and Ginny's relationship. Ginny could also learn some of Lily's magical tips.
One scenario could be that they meet in a time - travel situation. Harry and Ginny could be transported back in time to when Lily and James were alive. There, they would get to know each other in a different way. Harry would finally be able to have a proper conversation with his parents. They could discuss the future, the prophecy, and how Harry has changed the wizarding world. Ginny could bond with Lily over their love for Harry and their Gryffindor spirit. It would be a very emotional and magical encounter.
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.
It's possible that when they meet their kids, they realize that their family has a special destiny in the wizarding world. Their kids could be the key to uniting different magical communities or solving an ancient mystery. This could lead to a series of adventures where Harry and Ginny, along with their kids, embark on a journey to fulfill this destiny.
They might share a very emotional moment. Harry could finally let go of all the war - related stress and just be himself with Ginny. He might tell her about all the things he couldn't during the war, like his real fears and hopes for the future. And Ginny would be there for him, comforting him and showing her love in a more peaceful and free environment.