I have an awful memory so I'm not 100% sure exactly who was my 'first' pair but I think it was either Sukita (cause how can you not love the big evil king that lives in your head rent-free even if he hates your guts but really his just awful at showing his feeling cause his a 1000-year-old man) or Ottoge (since I watched JJK 0 before I watched the anime)

but I was quickly pulled into Goyuu once I really started getting into the fandom on X