I'm writing a fanfic rewriting Legend of Korra to make Korra an anti-hero who eventually allies with Kuvira and betrays her friends. It's called "The Tragedy of Korra". Have you ever thought that Korra would have been more interesting if Korra herself was more morally grey? I feel like it would have tied together a bunch of elements that didn't work too well in canon Korra.

i mean korra already is morally grey (liberal). but i do think a narrative wherein korra attempts to undo the (supposed) work of aang & zuko to establish a neocolonial state on earth kingdom land (republic city) by allying with kuvira could be interesting in terms of what would need to change in the plot for her to reach that conclusion. lok pretty uniformly portrays republic city as a good thing that only fascist monsters would attempt to condemn, but kuvira is also just categorically right that republic city is essentially a fire nation colony in a coat of fresh globalist paint, she's just wrong in her conclusion that returning that land to the earth kingdom means returning that land to her specifically. but korra grappling with the ramifications of the darker aspects of her predecessor's legacy is a very "avatar" story (aang w/ roku, kyoshi w/ kuruk, kuruk w/ yangchen, even korra w/ wan in book 2 i guess), and was only really elided by the narrative because we're supposed to agree with the construction of republic city in the first place (ymmv).

we're supposed to buy that aang and zuko established republic city and that rc is an ontologically independent state with no vestiges of fire nation imperialism left in its functioning, but it takes many large leaps in logic to arrive at that conclusion (such as toph establishing a police force; katara being fine with neocolonialism, including in her home; etc.), that this was a largely positive decision and not a geopolitical blunder. but i think taking a more realistic approach, that aang was forced to make compromises and now korra must decide whether/how to rectify those decisions and with whom to ally to do so, was always the kind of dormant subtext of lok that i felt like needed to be teased out more for the show to work in the direction it had been taken (which, again, is not necessarily the only or best direction they could have taken it).

i do think you'd have to change kuvira's character considerably to make her less cartoonishly evil (she is a fascist ethnonationalist who crowns herself emperor, puts minorities in internment camps, and harvests the resources of a sacred swamp to construct a wmd that is launched from a giant robot...) if you want anyone to buy that korra would ally with her, but korra does also ally herself with some pretty questionable figures, so i hardly think her naïveté in that regard is out of character for her either. i think politically speaking, lok kind of already is a tragedy, so you'll probably find yourself with both an easier and harder job than you'd expect attempting to rewrite the narrative from this particular angle.