I think Korra at season 4 sorta is okay. She actually has struggles and regrets, and has to get herself together.
If we're going by the idea that one video said about "if you replace them with a man, and nothing has changed, you're doing it wrong" so who would Korra be as a man? And the answer leads inevitably back to... Gavin from Brent Week's Lightbringer series. For the record, I cannot stand Kip post about book 3 or so, and skip him to read about Teia and Gavin.
Gavin, like Korra, starts out the gate as being strong, confident, and all-powerful. We see some strain while he builds a wall, but we are convinced that the story about the Prism is true. Later, cracks appear in that story, as we realize "That guy who was prisoner? Oh yeah, he's kinda Gavin. Maybe, or his brother Dazen. He's also crazy, so we're not sure." I won't give away how it comes out, but I ultimately liked his ending while I'm sure alot of people were like "Wtf?!?" Anyway, by the end of book one, Gavin is colorblind. And by the second or third book, he's also missing one eye.
Back to Korra. Poisoned by metal, somewhat crazy, shell-shocked by all of her battles, and we start to see that she doesn't write letters back to Mako, who was set up as her boyfriend. We don't see her write to Bolin either. Instead, the person she confides with is Asami. You have to get through alot of her acting more like confident Gavin than broken Gavin, but yeah, that moment comes.