One common theme is redemption. Springtrap is often portrayed as a character who has done bad things in the past, and through his relationship with the reader, he tries to make up for it. Another theme is the exploration of the unknown. Since Springtrap is a rather mysterious and spooky character, the fanfiction often dives into the secrets he holds. Also, the theme of acceptance is present. The reader usually accepts Springtrap for who he is, despite his flaws and his dark past.
Another theme is the exploration of an unusual relationship. Springtrap is not a typical love interest, so the fanfictions often focus on how the reader and Springtrap interact and form a connection that defies normal expectations. It could be a relationship based on mutual understanding in a very strange and dark setting.
One popular 'springtrap and reader mates fanfiction' is 'Springtrap's Redemption'. It focuses on a scenario where the reader character helps Springtrap overcome his dark past. Another great one is 'Springtrap's Secret Bond'. In this, the relationship between the reader and Springtrap develops in a very mysterious and engaging way. There's also 'Springtrap and the Reader: A New Beginning' which shows a fresh start for their relationship in a rather unique setting.
Common themes could include a power dynamic, with Springtrap being in a position of power over the reader. However, these types of fanfics are more on the edgy and inappropriate side. They may also include themes of seduction, but this is really not the kind of content that should be widely promoted. In a more positive light, some might explore the idea of redemption through love, but that's still within the context of a rather inappropriate genre.
One common theme is mystery. Given their spooky nature in the FNAF series, many fanfictions use their relationship to add more mystery to the overall plot.
One common theme is friendship. Despite their differences, the human versions of Springtrap and Mangle often form a strong bond in these fanfictions.
One common theme is the battle of good and evil. Foxy might be seen as a more 'good - ish' character compared to the clearly menacing Springtrap. Another theme could be redemption, where Springtrap might have a chance to change through his interactions with Foxy.
One common theme is horror. Given their spooky appearances in the game, fanfictions often use them to create a sense of dread. Another theme could be mystery, as there are many unknowns about their characters. Writers may also explore themes of survival, as if they are both trying to survive in the haunted environment of the FNAF world.
A common theme is the clash of their natures. Springtrap being a more menacing and haunted entity compared to the more 'playful' Toy Bonnie on the surface.
One common theme is power struggle. Since both characters have their own unique powers and abilities within the FNAF universe, fanfictions often explore who is more powerful between them. Another theme is the exploration of their shared past, as they are both products of the haunted pizzeria's history.
Friendship could be a common theme. Since it's about mates in a barn, the characters might develop strong bonds of friendship while sharing the barn space.