Characters need air between them to breathe, you know? I've always felt chemistry thrives on restraint – those glances held a second too long across the training ground when MK is showing off, a shared smirk when Monkey King does something predictably arrogant. It’s not just about the OC knowing his secret identity or power level; it's about seeing the person underneath the legend when he's exhausted after a fight, and offering a quiet bowl of noodles without comment. The dialogue should bounce, sure, but the silence matters more. Let them have an in-joke about the Tang monk's lectures, or a mutual, unspoken understanding of the weight that comes with being 'the chosen one' or trying to live up to a legacy. That shared context is the bedrock, and the small, specific kindnesses built on top are what make a pairing feel real, not just a power fantasy.
I've read fics where the OC is just a super-powered insert who fixes everything, and it kills any spark. The best ones let the OC challenge him in human ways – maybe calling him out on his ego, or being the one person who isn't impressed by the Great Sage Equal to Heaven title, but is impressed by his loyalty to his friends. That friction, that push-and-pull, creates way more heat than any perfect, adoring character ever could. My favorite moments are always the domestic ones slipped between battles – sharing street food, fixing his torn sash, a debate over the best animated movie. It grounds the cosmic scale of 'LMK' in something tangible and warm.