Since the Fairy Tail guild disbanded after the war with Tartaros, Natsu decided to build a company. And he named it END Industries, many people probably don't know including Natsu's friends that Natsu is extremely RICH. What with him battling the Twin Dragon Slayers of Sabertooth in the Grand Magic Games, his name as the Salamander spreads out across the whole continent of Fiore.
Natsu since the start of the Grand Magic Games has been intensely studying Quantum Physics, Mechanical Engineering etc. That's the reason why after Fairy Tail has retaken the #1 spot as the BEST guild in Fiore. Natsu still doesn't come to the guild for a whole month because of his intense studying,
Lucy is suddenly SHOCKED to find his best friend slowly become mature and intelligent because of his immense study in his books. While he still had his best friend exceed Happy, Natsu built his very first AI named JARVIS. Now this is the reason why the name Iron Man will become immensely popular among the whole guilds and continents in Fiore.
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Natsu Dragneel: The Invincible Iron Man
FanficAU: This is after the Tartaros Arc and where Natsu and Happy goes on their training, also Natsu is SECRETLY RICH and is extremely intelligent.
