(note: i am generally uncomfortable with sharing any of my romantic f/os unless we're already friends, especially the ultimate and primary ones.)
Ultimate 
koutarou bokuto ~ haikyuu ~ ace of hearts ~ song 1 song 2
sanji ~ one piece ~ delectable romance ~ song 1 song 2
dr. veritas ratio ~ honkai: star rail ~ amor omnia vincit ~ song 1 song 2
gale dekarios ~ baldur's gate 3 ~ woven by love ~ song 1 song 2
sasuke uchiha ~ naruto ~ ai o sagashite ~ song 1 song 2
Primary 
vinegar doppio ~ jojo's bizarre adventure: golden wind ~ romanza parte a ~ song 1
diavolo ~ jojo's bizarre adventure: golden wind ~ romanza parte b ~ song 1
mirio togata ~ my hero academia ~ love times a million ~ song 1 song 2
magna swing ~ black clover ~ arson ~ song 1 song 2
ryusui nanami ~ dr. stone ~ noble desire ~ song 1 song 2
king (harlequin) ~ seven deadly sins ~ faeted love ~ song 1 song 2
hidan ~ naruto ~ holy love ~ song 1 song 2
grimmjow jaegerjaquez ~ bleach ~ amor de mi vida ~ song 1 song 2
shuji hanma ~ tokyo revengers ~ beautifully batshit ~ song 1 song 2
donquixote rosinante ~ one piece ~ you are my heart song1 song 2
arataki itto ~ genshin impact ~ my one and oni ~ song 1 song 2
caesar clown ~ one piece ~ love potion no. 17 ~ song 1 song 2
eddie munson ~ stranger things ~ roll for romance ~ song 1 song 2
v ~ devil may cry 5 ~ love's star
denji ~ chainsaw man ~ chainsaw heart ~ song 1 song 2
viego ~ league of legends ~ lovers of the mist
ranpo edogawa ~ bungou stray dogs ~ world's greatest romance
vash the stampede ~ trigun & trigun: stampede ~ seeds of love ~ song 1 song 2
gyutaro shabana ~ demon slayer: kimetsu no yaiba ~ gore, grime, and obsession ~ song 1 song 2
seto kaiba ~ yugioh! ~ the heart of my cards ~ song 1 song 2
legolas greenleaf ~ lord of the rings ~ le anon veleth nin ~ song 1
boothill ~ honkai: star rail ~ roped into romance ~ song 1 song 2
wriothesley ~ genshin impact ~ chains of love ~ song 1 song 2
laios touden ~ dungeon meshi ~ hungry hearts ~ song 1 song 2
wade wilson/deadpool ~ marvel comics ~ merc with a heart ~ song 1 song 2
eddie brock & venom ~ marvel comics ~ something symbiotic ~ song 1 song 2
viktor ~ arcane song 1 song 2
amir beckett ~ warframe ~ void crossed lovers ~ song 1
messmer the impaler ~ elden ring ~ thy heart is mine
goro majima ~ yakuza/like a dragon ~ watashi no hime sama ~ song 1 song 2
choso kamo ~ jujutsu kaisen ~ the blood in my veins ~ song 1 song 2
adrian chase/vigilante ~ dc comics/peacemaker ~ love and justice ~ song 1
Secondary 

nicolas brown ~ gangsta. ~ song 1 song 2
kyojuro rengoku ~ demon slayer: kimetsu no yaiba ~ song 1 song 2
ban ~ seven deadly sins ~ song 1 song 2
*edward elric ~ fullmetal alchemist: brotherhood ~ song 1 song 2
galo thymos ~ promare
bartolomeo ~ one piece
nikolai gogol ~ bungou stray dogs song 1 song 2
ryou bakura/yami bakura ~ yu-gi-oh! song 1 song 2
leon s. kennedy ~ resident evil song 1
the twelfth doctor ~ doctor who song 1 song 2
anaxagoras ~ honkai: star rail song 1