The Netflix ATLA adaptation is going to suck

ah yes, i cannot wait until the siblings are played by cast that dont even look alike or anything like the animated character, itll be a white chick with red hair and freckles to play the girl and a big 6'2 elderly black man to play the boy lol

Redheads aren't allowed in Hollywood anymore, but because you mentioned she'd be a redhead, Hollywood is now obligated to make her black.
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Her brother will be played by a girl - possibly Asian - with freckles

Red headed African American transgenderd flat-chested Goth.

You forgot Non-Binary and some form of gay, and whatever the PC term for overweight is these days