Well, perhaps Tonks could be on a mission at Hogwarts and she accidentally bumps into Harry. She might show him some cool magic tricks that first - years don't usually see.
In fanfiction, when Harry meets Tonks at Kings Cross, they might share some interesting news. For example, Tonks could tell Harry about the latest happenings in the wizarding world that he might have missed while away. It could also be a chance for a friendly chat, perhaps about how Tonks is getting on with her Auror training or any new spells she's learned.
Ginny Weasley could be another character. Given her relationship with Harry in the original series, in the fanfiction she might be part of the harem, bringing her own strong - willed and talented self into the mix, and her experience with the Weasley family's magic and values could influence the group.
Well, in some fanfictions, Harry might comfort Tonks by simply being there for her. He could listen to her problems, like if she's worried about her family or the situation in the wizarding world. Just his presence can be a source of comfort.
A major theme is the struggle with society's expectations. In the wizarding world, a werewolf like Remus is often stigmatized. Fanfictions often explore how Tonks and Remus deal with this. Also, the theme of redemption can be seen. Remus may see Tonks as a sort of redemption, a chance to have a normal life despite his affliction, while Tonks may see helping Remus as a way to redeem the unfairness of the world towards him.
In fanfiction, their first encounter might be reimagined in various ways. It could be a chance encounter in Diagon Alley, where they bump into each other and there's an instant spark. Tonks' colorful hair and Remus' calm demeanor could create an interesting contrast from the start.
One of the main characters would likely be Lupin. Since he has a connection with Tonks, his presence could add a lot of drama to the story. He might suspect their relationship or even accidentally discover it. Another could be Hermione. She's always observant and might pick up on the signs of their relationship, and could either support them or be concerned about the implications. Ron could also be in the mix, perhaps being a bit clueless at first but then getting involved in some way.
Yes, in some fanfictions, Tonks could potentially be written as Harry's pet. Fanfiction allows for a great deal of creative liberty, so authors can come up with all sorts of unique relationships between characters.
No. Enslaving someone is an immoral concept, and in the context of a Harry Potter - based fanfiction, it goes against the spirit of the original series which promotes friendship, equality and fighting against oppression.