The MC is Ryukyu's younger brother ....
The MC's Quirk will be the Dragon Slaying abilities of Acnologia ....
These abilities are :
* Full Dragon Transformation
* Partial/hybrid Dragon Transformation
* Enhanced Physical abilities to Dragon levels
* Enhanced Dragon Senses
* Energy & Elemental devouring
* Dragon Slaying Magic
It would be hard for the MC to master any element....
He'll be able to use ALL elements ....
But most likely , he'll just use pure energy like Ki of Dragon Ball world , to create energy constructs , cause explosions & enhance his body even more ....
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The MC isn't reincarnated
(I don't own anything but my original ideas)
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The MC will have The very basic abilities of an elemental-less dragon slayer ...
Enhanced senses , Enhanced physical abilities , Dragon Scale generation , Basic magic energy control ....
To progress and gain the ability to manipualte and eat elements , He'll need to experience a certain element and sense it , then try to make his magic energy mimic it ....