One common theme is redemption. Since both characters have had their share of difficult pasts, many fanfictions explore how they can redeem themselves in each other's eyes. For example, Snape's past actions as a Death Eater and Lupin's lycanthropy - related issues.
Another theme is the adaptation to the new situation. They have to deal with the physical and emotional changes that come with the male pregnancy. For example, Lupin, being a werewolf, might have additional concerns about how his condition could affect the pregnancy, and Snape would use his potions knowledge to try and ease any difficulties.
Another theme is the exploration of the werewolf aspect of Lupin. Fanfictions might show how Hermione reacts to Lupin's lycanthropy and how she might try to find ways to help him or understand it on a deeper level. For example, she could be researching ways to ease his transformations.
In many lupin tonks fanfictions, the theme of sacrifice is present. Lupin may sacrifice his own happiness for Tonks' safety or vice versa. Another common theme is the idea of redemption. Lupin, with his werewolf nature which is often seen as a 'flaw', finds redemption through Tonks' love. Also, the theme of friendship within their relationship is important. Their friends play a role in either supporting or challenging their relationship, which is often explored in these fanfictions.
One great Lupin and Snape fanfiction is 'The Unlikely Alliance'. It delves into their complex relationship, showing how they might overcome their differences in a post - Voldemort Hogwarts. Another interesting one is 'Shadows of the Past' which explores their student - teacher days and how events back then influenced their later interactions.
Adventure is also a popular theme. They might go on a quest together, perhaps to find a lost magical artifact or to solve a mystery that has been plaguing Hogwarts for years. Their combined skills - Hermione's book - smarts and Lupin's practical experience - make them a great team for these adventures.
One common theme is the clash of different worlds. For example, when Lupin crosses over with a more modern - day or high - tech setting, like in a crossover with a cyberpunk - themed story. There's the struggle to adapt to new rules and technologies while still maintaining his thieving ways.
One common theme is friendship. The OC often becomes a very close friend to Remus, sharing in his joys and sorrows. For example, they might be there for him during his difficult full - moon times.
One common theme is isolation. Remus often feels alone because of his werewolf condition, and fanfictions explore how this isolation hurts him deeply, cutting him off from normal social interactions.
Their contrasting personalities also make them an appealing pair. Snape is often seen as brooding and mysterious, while Lupin is more gentle and kind - hearted. Writers enjoy writing stories where these two personalities clash and then find common ground. For example, in many fanfictions, they start off hating each other but then realize they have more in common than they thought, like their loyalty to Dumbledore and their love for Hogwarts.
Love against all odds is a very common theme. Given Remus' condition as a werewolf, they face a lot of opposition and prejudice. Fanfictions often explore how their love overcomes these difficulties.