I've spent way too much time scrolling through these on AO3, and honestly, the most consistent thing is the utter clash of worlds. You've got this ancient, aristocratic monster plopped into the chaotic, neon-drenched reality of Johnny from 'Cyberpunk 2077'. The writers seem to latch onto that contrast like a lifeline.
A huge theme is predator vs. predator. Johnny's already a digital ghost haunting a dying world, and Dracula is the original parasitic force. A lot of stories explore whether they'd see each other as kindred spirits or immediate threats. Does Dracula view Johnny's engram existence as a fascinating new form of immortality, or a pathetic, hollow mockery of it? That tension fuels a ton of philosophical debates disguised as action scenes.
Beyond the obvious power struggle, there's a surprising amount of 'odd couple' or even romance. The 'enemies to reluctant allies' arc is everywhere, usually forced by a mutual enemy in Night City or the corpo world. I've also seen a niche but persistent thread of Johnny being the one person Dracula can't psychologically dominate or turn, because Johnny's mind is already a fractured, stubborn mess living on a shard of biochip. Their dynamic becomes less about fear and more about this grudging, abrasive respect that sometimes, weirdly, tips into something else. The setting of Night City, with its own vampires of a corporate sort, provides a perfect backdrop for Dracula to operate in a new, terrifying way.