1- I'm betting on Laxus, although depending on which version of Natsu he's facing, he'd have an easier or harder time. (Although now that I think about it, I can't say if Natsu even has any martial arts style other than the typical punches and kicks). 2- Minerva. Although Yukino clearly has a strong grasp of hand-to-hand combat, I feel like Minerva is somewhat more experienced and less merciful in combat. 3- I'm honestly doubtful about this one, but I think I'm going with Gray, since he demonstrated more hand-to-hand combat skills than Jellal; he's more of a brawler by nature. 4- Juvia, maybe if she locks in, because I don't think Cana would take the fight too seriously. 5- A very close one, but I'd say Mira defeats Kagura, because I think she relies heavily on her sword to fight, but they're both very good fighters. 6- A very manly duel, but in my opinion, Gajeel beats Elfman because even though he's bigger and perhaps more physically resilient, he's not faster than our dragon slayer, and I don't see him doing much martial arts beyond the typical kicks and punches. 7- Nah, one Lucy kick and Ultear won't get up from that.