User blog comment:CallMeKnuckles/DEATH BATTLE Prediction Blog: Natsu VS Ace/@comment-26184007-20170419144919

So, I know this may be to soon to write my prediction. But, I have researched these two characters and their abilities and traits before they announced this Death Battle. So my bet is on Natsu Dragneel, here are the following reasons:

1. To be able to bypass a Logia, either by haki, seastone, exploiting the element itself, fast sneak attacks. The way that Natsu can be able to touch Ace's flame body is that because Natsu can touch and hold fire like a physical object: 'http://www3.mangafreak.net/Read1_Fairy_Tail_495_19#gohere'. That could be a way to exploit Ace's fire logia weakness, regarding he landed on a pure flaming dragon Atlas Flame, who can also become intangible fire since a breath attack passed through him. Natsu is quite fast himself, but he becomes more faster in Dragon Force, Lightning Flame Dragon Mode or Fire Dragon King Mode. Knowing now that Natsu can enter Dragon Force at his own will now, Natsu's speed in Dragon Force is to the point where he speedblitz Jellal's speedy Meteor. Which means that Natsu can be fast enough to pull a sneak attack that can hurt Ace, especially when using Crimson Lotus: Phoenix Blade. If one piece fans don't accept that, then on Fairy Tail terms, Natsu is able to exploiting the weak points of his opponents attacks and abilities, even knowing the timing of attacking. He may know the timing of Ace phasing and reforming, which will give Natsu the right time to strike him. This was shown when Natsu read both Sting and Rogue's attacks and defeated them even though both were in Dragon Force.

2. Natsu can also eat fire to regain his energy and magic power, making him stronger. Since Ace's fire attacks are huge, that can't hurt Natsu but rather greatly increase Natsu's magic and strength, making him greatly stronger. Some say that "If Natsu eats Ace, Ace will reform and explode Natsu from the inside". No, rubbish, that would be against the Death Battle rules because that is unknown information and it is stated that logia users become the element. On the contrary, it is only known that the fire Natsu eats converts into magic power and/or enhance his abilities. Also, it would be impossible for Ace to reform since Natsu's Dragon Slayer Magic makes him powerful as a Dragon, I mean he was taught by the Fire Dragon King, Igneel. If Igneel has eaten Ace, would Ace try to reform and explode Igneel? No.

3. For scientific terms and physics, Natsu's fire is more hotter and stronger than Ace's fire. Chapter 446, Natsu has vaporized a huge amount of sand, which would make his flames burn at least 3000 degrees celsius. Natsu's flames are even strong enough to incinerate Zeref's death magic, at least in Fire Dragon King Mode or Dragon Force (Chapter 531). My prediction is that Stronger Fire (Natsu) > Weaker Fire (Ace). Also, in terms of Natsu's powerful spells like, Fire Dragon's Iron FIst, Fire Dragon's Roar, Fire Dragon's Brilliant Flame, Crimson Lotus: Exploding Flame Blade, Fire Dragon King's Demolition Fist or Fire Dragon King's Roar can produce such explosive effects that will blow Ace back by recoil effects, hurting him. Lightning Flame Dragon Mode could be able to hurt Ace, since Ace's fire has to be at least hotter than a candle flame that would produce ions for electricity to conduct through it.

That's all of my prediction for now, I may add more later.