Nowi is kind of worse in context considering the designers do that BS of "looking a lot younger then what they are". In this case, Nowi is 1,000 years old but looks prepubescent. To top it off one that, she wears a revealing outfit and has a naive quirk with her being amused by human development to the point of pointing out "boingy bits". Also to push it further, she's not a human but rather a Manakete (dragon), so it technically could count as a form of bestiality/interspecies romance.
Don't even get me started on the fact that Fire Emblem: Awakening has the selling point of marrying others and producing children.