Okay, so I stumbled into this corner of 'Five Nights at Freddy's' fanfiction kind of by accident, and Ennard x Ballora stuck with me in a way I didn't expect. A lot of people just see Ennard as this horrifying amalgamation of wires and masks, which, fair. But the fics that dig into its relationship with Ballora—the only animatronic with a defined, graceful, almost maternal personality pre-melting—tend to explore some really messed-up but fascinating intimacy.
It usually starts with the shared experience of being scooped and hollowed out, that literal emptiness. But writers take it from 'we're both monsters' to something more specific. Ballora's programming was about elegance and music, and a lot of stories have her trying to maintain that composure, a sense of self, amidst the chaotic tangle of Ennard. She becomes a point of order, or maybe a memory of what they all were. Ennard, in turn, is often written as possessive and jealous of that memory, yet reliant on it for any sense of identity beyond 'thing that wants to wear you.' It's a dance between wanting to preserve her and wanting to consume that last bit of beauty for itself.
I've seen it played as tragedy, horror-romance, or even a weird found-family thing with the other Funtime parts bickering in the background. The dynamic isn't about love in a human sense, but about two broken things recognizing the shape of the break in the other. One fic had Ennard trying to hum Ballora's music but getting it wrong through all the other voices, and her patiently 'correcting' the tune from deep within the mess. That kind of detail sells it for me—less about passion, more about two ghosts trying to remember how to haunt in harmony.