Water, absolutely no question.
It's consistently portrayed as the most powerful element in the show. No ocean, no problem. Pull it out of the air, the grass, your sweat, your -blam!-ing opponent! It's so metal.
Come to think of it, water bending might need a nerf...
English
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What kind of enemies do you expect have Lol. I just chose Air bending to fly
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Well no body expects to have any sort of enemies. Until the fire nation attacks! ψ(`∇´)ψ
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Lmfao
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Airbending needs a bigger nerf than that, you need air to live bruh, no oxygen and you die. Not to mention they can fly and remove their spirit from their body and essentially -blam!- around with people as a ghost.
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Blood bending can remove someone else's ability to bend. So even if you suck the air from my lungs, I'd have a good 25-30 seconds to take away your bending and leave you a bloody mess.