Basically, non-human characters or characters with animalistic features will be considered spirits. As such, they will not be benders in the typical sense of the word. Instead, they will have nature-based abilities or alternatively, a watered down version of their abilities in canon as long as it fits the ATLA/LoK universe. If you would prefer for your character to "live as humans," such as living in an apartment and having a job, that's perfectly fine.
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Basically, non-human characters or characters with animalistic features will be considered spirits. As such, they will not be benders in the typical sense of the word. Instead, they will have nature-based abilities or alternatively, a watered down version of their abilities in canon as long as it fits the ATLA/LoK universe. If you would prefer for your character to "live as humans," such as living in an apartment and having a job, that's perfectly fine.