Silver_Stellier
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His power administration controls all small living organisms. But due to its damaged nature, its try power was suppose to control everything. It is a master power.
Vongola
Vongola Family
Well, you could always try to persuade Maleficent to take care of it. You know fight fire with fire, or in this case, dragon against dragon. And yes, it has been theories that the dragon is a princess and that donkey is the kid that was turned from Pinocchio.
The Pathways to Ascension
I would go for electric powers as if mastered leads to magnetic and thermal powers. Even at it weakest, you can channel it through any conductive matter, and it is versatile. You can use it on large-scale weather manipulation, engineering feats, and enhancement on one's own biology.
It should have been a Massive Hammer.
I always believed you just had the wrong size of glass cup.
Metal isn't really necessary when he has armament haki. It's not that he really needs something like metal dragon slaying magic.
Indomitable spirit of mankind
Look up Campione for awesome immortal kill method with flying swords.
Dr Stone kindly of equipment
It was HYDRA acting as SHIELD