I think the issue between Lin defenders and Su defenders lies in the fact that both sides complain about the other and demonize the opposite character in the exact same way—just reversed. The truth is, both of them have serious flaws in the show!! That’s the point of any literary or fictional character: the goal in storytelling is to allow characters to grow, become more complex, and more interesting. And since fictional characters are inevitably based on reality, their personalities and mistakes are, at the end of the day, human. Most of their actions can’t be justified, but they can be understood.
Regardless of who I personally prefer, I think: Su has character development because she represents the idea that “everyone deserves a second chance.” Not a third or fourth—but a second. She paid the consequences she had to (moving away, seeking knowledge, traveling, etc). Maybe those consequences weren’t as harsh as some people would’ve liked, but they did happen and she followed through. Maybe they weren’t the fairest when you think about things like… ROBBING and joining a borderline gang at 13 years old like… wtf.
On the other hand, Lin represents all the older sisters frustrated with their younger siblings, those who went through parentification but were never truly acknowledged by those same siblings. She made mistakes too, of course—she’s stubborn, rigid, emotionally reserved, and was even paranoid with Pema, Opal, and others. But that’s also part of her arc. Lin lives alone in her 50s, but by choice. And if that makes her suffer… maybe that’s her self-inflicted punishment(?)—depending on how Su defenders interpret her resentment or her choices.
But honestly, it’s funny how fans argue like crazy when at the end of the day, Lin and Su reconcile. They accept that they love each other as sisters, despite the damage they may have caused. Maybe there wasn’t a dramatic apology or a super deep conversation... sure, Su can come off hypocritical or cynical at times, and Lin can be unbearable and intense—but both of them did the best they could while growing up in the shadow of a mother like Toph.
Toph might actually be the root of all this… AND I LOVE TOPH. She and Sokka are literally my top 2 favorite characters!!!! But come on—where there are kids with issues, there are parents with issues. And both sisters craved their mother’s attention in totally different ways. Lin lived alone with Toph for about six years, which probably made them closer. And Lin’s more mature, aware personality may have led her to think: “If I become like her, she’ll give me all the attention I want. We’ll have the same schedule, same interests, and end up talking about the same things.” Su, meanwhile, is the younger sister—six years younger. Like most younger siblings with a big age gap, she was probably “raised” a bit by Lin, and not very willingly. She spent less time with Toph, and that’s hard. So Su tried to get attention differently—by standing out and not being like her older sister, as younger siblings often do when they stop idolizing and start rebelling.
It's impossible not to compare characters, especially when they're siblings who grew up in the same environment but turned out completely different from one another! (In psychology, this is called EQUIFINALITY. Basically, it means that a single starting point can lead to multiple different outcomes.)
Or in other words: Different paths can lead to the same result, and the same path can lead to different results.Even if two siblings grow up in the same family system, each one:
1.Has a different subjective experience.
2.Fulfills a different functional role.
3.Forms unique alliances, conflicts, and emotional bonds.
As a result, they may develop completely different personalities, values, or ways of connecting — even within the same environment. That’s equifinality in action. It’s not a competition, obviously — but you get what I mean.
Both of them were girls who lacked emotional attention and proper guidance.So yeah—now they’re both doing fine. They’ve made big mistakes, but they’re also victims of the parenting style they grew up with… and of the lives they each chose to live.