Boi, everyone who say Natsu can one shot Ace must be on some hard shit. First of all they aren't compatible as opponents as Ace is a logia and all of Natsu's flame type attacks won't be able to hit him and Ace can just flow into his attacks anyways and none of Ace's flames will be able to hit Natsu. Don't give me that shit that Natsu's flame is more powerful than Ace's. The reason why Akainu was able to hit Ace was because magma smothers and hardens flame and Ace was in human form to protect Luffy and extinguished his body in flames as he was about to die and his devil fruit was going to disassemble. Anyways Natsu's flame is stronger than Ace's as it comes in bunches and forms a big ass flame, otherwise its the same temperature as shown in color. Even if Natsu gets to use Lightning Dragon mode this man won't be able to hit Ace as he can just stay as Logia and same for Black Fire Dragon form. His most powerful fire form Fire Dragon King mode was given to the man and even if it is enabled it stays at like Lightning Dragon mode. No matter how hot Natsu's flame is this man won't be able to hit ace as his element is still the same and he doesn't have Haki. Don't give me that shit where Zeref's black magic was destroyed either. First of all Zeref's magic is just a force and Natsu was using Dragon Force a mode which he can't enable himself and his scarf protected him. Also Natsu's flame can burn through metal and buildings, but Ace's fire can burn through Aokiji's ice which was shown as thicker than metal at Marineford and holds a higher position then diamond Gozu who literally has a paramecia which turns his body to diamond. Everyone also saying that Ace can just be swallowed, but what about human form. Logias can switch consistently without any force or restraint. Oh yeah Natsu get restraint and hurt after using his fucking Dragon modes doesn't he. Man Natsu can't do shit to Ace, but Ace can't do shit either as Natsu is immune to flame and even if Ace can flow and control Natsu's flame, Natsu can just expel the flame. Anyways they're mismatched and can't fight each other, but don't hold my man Ace short and don't over exaggerate Natsu. In the long run though Ace can win and don't throw me that thought projection and curse power shit as that's just some expensive monologue. In hand to hand though Natsu would win as he basically has enhanced everything and we never seen Ace's skill with his Bowie Knife. Natsu vs Sabo though, Sabo win after a while just like Ace would and in hand to hand. Also Fairy Tale characters emotionally unstable and in a deserted island Natsu kind of toast and Ace is capable of Conquerors Haki.