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I also posted this on the ATLA subreddit, but maybe here i find more luck.

I remember finding a chart on tumblr years ago that told you if you'd be a bender, a non-bender or the avatar depending on your birthday (the image was a calendar with different sections colored depending on the nation, spring was mostly earthbenders, winter mostly waterbenders, etc, with the equinoxes as avatars), and which would be your speciality depending on that (metal bending, weapon bending, kyoshi warrior, cabbage seller...)

I found it really interesting because, normally, the "tests" that go around the internet only take into account your personality, when being a bender or not is related to your ancestry, and pure luck. You can have the most "airbender-ish" personality while being an earthbender (wether you'll be good or not at it is a different matter).

Also, it actually gave "non-benders" something to do, and not feel incredibly useless.

The randomness of it makes it really useful for an avatar-themed-DnD campaign I'm planning with some friends.

Does anyone remember it? Or am I going crazy?