Responses
https://www.mangago.zone/read-manga/itoshiki_ningyo/
https://www.mangago.zone/read-manga/gone_with_the_bubbles/
https://www.mangago.zone/read-manga/the_falling_merman/
https://www.mangago.zone/read-manga/samezoku_e_no_sasagemono/ ( not merman but is like half shark cuz he has shark black blood in him)
Just rewatched Barbie The Pearl Princess and now I need some merman BL recommendations (▰˘◡˘▰)