User blog comment:IamJakuhoRaikoben/Chapter 456: Order, Review./@comment-67.5.245.122-20151012000216/@comment-95.51.118.58-20151013193644

Natsu is dark? Okay, I would like it if he developed as a character too, but 'dark' sounds like the exact opposite of his personality - so far. Lucy being light? Haven't seen any hints for that in manga or anime. Nor do I see any resemblance between Lucy and Mavis besides the hair colour and the fact that both of them belong to Fairy Tail... just like pretty much all main characters in this manga. What a coincidence. And Dragneel brothers are clearly different when it comes to their personalities.

Most of hardcore NaLu shippers are pretty much making up Lucy's relevance to Natsu's backstory because they desperately want them to have as many links as possible, which is unnecessary and strange - it's a shounen manga after all, not romance. Not that I completely dislike this genre, but if you want to see a nice manga that is obviously about romance, I recommend reading "Kaichou wa Maid-sama!" or something like that. Fairy Tail is about fighting with magical powers, friendship and family, so overanalysing each and every manga panel in order to find nonexistent hints for nonexistent romantic relationship is a wild goose chase.