any minor/adult ships are gross I won't change my opinion for ex Starker is Peter Parker x Tony Stark Peter is 15-16 depending on the fic sometimes 17 while Tony is 48-56 depending on the fic and in canon they have a FATHER-SON relationship and don't get me started on ageing up it barely changes a thing and you cant say "Its fine if it's consensual" but the fics may not show how dangerous large age gaps in relationships can be
so yes some may be harmless but it's usually very toxic and the works romanticize it in a way where minors may think its normal and shouldn't be worried Starker is something I will never ship or like it is, IMO, disgusting (It doesn't matter if the actors are of age the characters they portray are not so just- don't)