Yes, there are some out there. Some fanfictions might focus on their unique relationship, perhaps a friendship or a more complex emotional bond. They could be set in different scenarios within the FNAF universe.
Well, it's likely that there are 'human foxy x bonnie fanfic' available. A lot of fanfic writers like to explore different character relationships and interpretations. You could also look into related fanfic communities on social media platforms. Sometimes, fans will post links or recommendations for fanfics that involve this pairing. Just be aware that the quality can vary widely from one fanfic to another.
Love is a very common theme. Since they are in a human context, their love is more about normal human connections, without the supernatural elements influencing it directly.
Well, a very common theme is the relationship development. At first, the male human may be scared of Bonnie like in the original 'Five Nights at Freddy's' setting. But as the story progresses, they start to understand each other. There could be cultural differences explored too, as Bonnie is an animatronic from a very different world compared to the human. And of course, there could be themes of self - discovery for both characters as they interact more and more.
To develop Foxy's personality, we could show his loyalty. If there's a situation where Bonnie or the human is in danger, Foxy is the first to jump in and defend them. He could also have a bit of a temper at times, which adds depth. Bonnie can be the more gentle and empathetic one. He's always there to comfort the human when they're feeling down or out of place. The human's personality could be shaped by their experiences in this new world. They might start to take on some of the traits of Foxy and Bonnie as they bond with them.
A plot could involve the human getting lost in the world of Foxy and Bonnie. Foxy and Bonnie then have to protect the human from other more dangerous characters. As they do this, they start to develop a deep bond with the human. Maybe the human has a special power that they don't know about until they are in danger, and this power ends up saving Foxy and Bonnie in a crucial moment.
You can try fanfiction websites like Archive of Our Own. There are often a lot of FNAF - related fanfictions there, and you might be able to find some good ones about human Foxy and Bonnie.
There's also 'The Human Bond'. In this fanfiction, it delves deep into how Bonnie and Damon, as humans, deal with family issues while also developing their feelings for each other. It's really interesting to see how their human vulnerabilities play a role in their relationship.
You can expect a unique take on the characters. It might explore their relationship in a romantic or platonic way. There could be new backstories created for them as humans.
I'm not sure of specific ones off the top of my head. But you could try searching on fanfiction websites like Archive of Our Own. They usually have a wide range of 'Five Nights at Freddy's' fanfictions.