I'm not sure how familiar any of these will be, but I started as a dyed-in-the-wool Sanzo x Hakkai shipper in Saiyuki before wholly and irrevocably joining team Hakkai x Gojo. Similarly, the friends who got me into Fullmetal Alchemist were Maes Hughes x Roy Mustang people, but I shifted to Roy Mustang X Edward Elric. And I started IWtV fandom as a Louis/Lestat person, but am now 100 percent Louis/Armand (albeit the original Armand, not the reconned bratty kid version from The Vampire Lestat on).