Okay, this is a niche I've spent way too much time in. Clock and Notepad fics are weirdly intense given the source material is a surreal nightmare puppet show. A lot of stories lean into the inherent power dynamic—Clock's aggressive, time-obsessed control versus Notepad's quieter, observational anxiety. You see a ton of 'Office AU' stuff, which is hilarious because they're literally office supplies, but writers twist it into mundane corporate hellscapes where Clock is the tyrannical boss and Notepad is the put-upon assistant documenting every minute of misery. It's a metaphor for creative burnout, honestly.
Another big theme is memory versus time. Clock wants to move forward, erase the past, stick to the schedule. Notepad is literally a record keeper. So you get these angsty loops where Notepad is trying to preserve moments Clock is desperate to destroy, and the tension becomes this twisted form of care. I've seen a few surprisingly tender fics that frame their arguments as a messed-up way of keeping each other 'real' in their fabricated world. The body horror elements from the show sometimes bleed in, too—gears sticking, pages tearing—used as physical expressions of their dysfunctional dependency.
But yeah, the most common thread is probably a corrosive, codependent relationship that's equally about fascination and frustration. It's less romance and more psychological horror masquerading as a ship, which fits 'Don't Hug Me I'm Scored' perfectly.