Natsu and Lisanna may look good as a couple, but I just don't ship it. Even though they were childhood friends and knew each other longer than Natsu and Lucy, I personally prefer NaLu. In the anime, it mostly show Natsu and Lucy having more chemistry (like bonding in their relationship) than Natsu and Lisanna. Imo, I don't think NaLi will ever happen. I might be wrong, but I just don't see it happening since Natsu and Lisanna lost their "bond/chemistry". In the anime, it rarely show much of the NaLi moments compared to the NaLu moments. I don't have anything against Lisanna btw. I think Lucy is more suitable for Natsu than Lisanna because I can see their relationship working out. Plus, even the author voted for NaLu and named their child (if they had one) Nashi.