I'm going to have to go with Natsu for a few reasons.
1) Loki is a Celestial Spirit and I'm not really sure how a lion could/can mate with a human. After all that is his natural form. 2) He was the one who got her in to FT he was her first friend, he always catches her before she falls down (you get my meaning). 3) When it comes down to it if u look at all the art of this couple can u honestly tell me that they don't simply look amazing together?
Its definately natsu for obvious reasons. Natsu is always door her side, helping her out and being there for her when the times are tough. He is defintely the ideal guy for her not just because they are so close but because they treat eachother meer than family. Natsu went all crazy when future lucy died and if the preent lucy died i think he would be over 9,000 times worse. That is why Natsu is the best choice. ( NALU 4 LIFE)
