ouuu okay okay lemme put my thinking cap on. im fairly drunk so idk how accurate this will be but:
gojo - daddy kink, mommy kink (gojo clan issues go brrrr), degradation kink (he always hears he’s the best so anything else is exhilirating)
toji - praise kink (has never heard positive reinforcement in his fkn life), daddy kink w megumi
megumi - daddy kink w gojo and toji/father figures, likes claiming or being claimed in the most tame-to-crazy ways (as simple as matching bracelets to branding)
sukuna - biting/sucking/blood kink. likes to leave marks. also likes claiming but more on the fucked up end (tattooing, branding, etc), also mommy issues but no mommy kink bc that’s too much for him and he’s rejected the need for that connection (maybe one day tho)

i didn’t get much into fetishes bc it’s nearing my bedtime and im v fucked up but i may return to this question and get more into it w more characters