Not Yu Yu Hakusho specifically, but I would call Pearlshipping, Hamtaro/Bijou from Hamtaro, Tenchi/Sasami from Tenchi Muyo!, and Makoto/Setsuna from School Days my cornerstone anime couples, the ones from which my other favorite anime couples derive their inspiration based on what I learned. In the case of Pokémon, it was during Sinnoh that that show came closest, as it did, to colliding and intertwining with my broader real-life interests, so that I would've been perfectly content to see Ash and Dawn end Diamond and Pearl by setting up and taking charge of a system to promote freedom and peace for humans and Pokémon alike, then making their romantic partnership official, thereby turning the focus more firmly toward Cilan and Iris' adventures together in Unova, so to speak.