Well, in our world, we have benders who have the ability to manipulate one of four elements: Water, Earth, Fire and Air. Only one person has the ability to bend all for elements, the Avatar. Aang's the Avatar in our lifetime, and he's actually at the school as well! But he hasn't exactly mastered firebending yet...
Other than that, Toph is an Earthbender-- she can manipulate earth, rocks, sand, and metal. Zuko and Azula are Firebenders, but Azula is the only one who is capable of shooting lightning.
[Katara watches as the Headmaster repetitively pokes at the water-- a couple moments later, she lets out a breath against the liquid, freezing it.]
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Other than that, Toph is an Earthbender-- she can manipulate earth, rocks, sand, and metal. Zuko and Azula are Firebenders, but Azula is the only one who is capable of shooting lightning.
[Katara watches as the Headmaster repetitively pokes at the water-- a couple moments later, she lets out a breath against the liquid, freezing it.]