Another aspect could be his sense of duty. He might feel that he has more important things to focus on, like fighting against the Dark forces. He believes that a relationship would be a distraction, and to protect Tonks from the potential harm of his dangerous life, he dumps her.
One possible reason could be his self - loathing due to his werewolf condition. He might think he's not good enough for Tonks and that she'd be better off without him, fearing that his lycanthropy could bring danger or a difficult life to her.
It could lead to a whole new dynamic in the wizarding world. Maybe they'd have more adventures together and play a greater role in protecting it.
There are also authors who are really good at character development in their fanfictions. Take 'TonksTales' for example. They create stories where Lupin and Tonks' characters are very true to the original books but also have new and interesting facets added. They might explore Lupin's insecurities in a new light or show Tonks' Metamorphmagus abilities in unique situations. Another great author could be 'RemusAndNymphadora' who writes stories that are often set in different time periods of the 'Harry Potter' world related to Lupin and Tonks.
Well, first of all, they have very distinct personalities. Tonks is this fun - loving, shape - shifting witch, and Lupin is the more brooding, intelligent wizard. Their contrast makes for an interesting dynamic. Also, their relationship in the canon is somewhat underdeveloped, so fanfiction writers get to fill in the gaps. They can explore how Tonks first fell in love with Lupin, how Lupin overcame his self - doubt to be with her, and all the little moments in between that we didn't get to see in the books. It's like they are a blank canvas waiting to be painted by creative minds.
Maybe it's because Hermione represents a new beginning for Lupin. She has a different energy compared to Tonks. Lupin could be drawn to Hermione's thirst for knowledge and her ability to look at things from a unique perspective. In fanfiction, the author can create all sorts of reasons, and this could be one of them.
One interesting fanfiction could be about Tonks and Lupin's relationship during the early days of their acquaintance at the Order of the Phoenix. It might explore how they first noticed each other's unique qualities, like Tonks' Metamorphmagus abilities catching Lupin's attention.
One interesting fanfiction could be about Lupin and Tonks' relationship during the final battle. It might show how they supported each other and fought side by side. Another could be a pre - story of how they first met, perhaps at the Order of the Phoenix headquarters, with Tonks being all clumsy around Lupin which is really cute. There could also be a fanfiction where after Lupin's death, Tonks in a magical way gets to communicate with him one last time to say goodbye properly.
One great Lupin and Tonks fanfiction is 'The Lupin - Tonks Story' on FanFiction.net. It really delves into their relationship, from their initial meetings to the deeper emotional bonds. The writer captures Tonks' free - spirited nature and Lupin's more reserved personality very well, making their interactions seem natural.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of 'Harry Potter' fanfictions, and you can specifically search for ones related to Tonks and Lupin. Just type in their names in the search bar and you'll get a bunch of options.
One interesting fanfiction idea could be that Snape discovers a hidden Horcrux that Lupin unknowingly has in his possession. Harry Potter then has to figure out how to destroy it without harming Lupin. This would add a whole new layer of drama and mystery to the existing lore of the Harry Potter world.
In such a fanfiction, perhaps Harry would grow up with a more nurturing and understanding environment. Lupin could teach Harry about the wizarding world in a very different way than the Dursleys. He'd likely introduce Harry to magic earlier and help him better understand his parents' legacy.