I've always found the way Entrapta and Hordak's relationship rewires the 'enemies' concept so interesting. It starts with such a pure, transactional tech-exchange – she wants to tinker with First Ones tech, he needs a genius to get his portal working. The trust is entirely conditional and built on mutual utility.
But then you see it crack. Hordak letting her call him by his real name, that tiny vulnerability. For her, trust is data: he hasn't betrayed the data-sharing agreement, therefore he's reliable. For him, trust is loyalty: she stays when she doesn't have to, fixes his armor, sees his 'defect' and calls it an 'upgrade.' Their rivalry isn't against each other but a shared, silent rivalry against their own circumstances – her being dismissed as 'weird,' him being cast out by Horde Prime. The power dynamic flips constantly; sometimes she's the one in charge of the science, sometimes he's the commanding force, but they keep meeting in the middle over a shared soldering iron.
It never gets simplistic or saccharine. Even at the end, their partnership is two socially awkward outcasts who finally found someone whose operational parameters they understand, building something new together from scrap.