Zuko's "weakness" is brilliant
Just saw a post asking "Is Zuko the weakest bender on Team Avatar?" I audibly gasped when reading it
"Of course not, it's Zuko, he's a firebending menace." was my gut reaction. Until I thought about it, and realized that it's true, Zuko's bending proficiency is probably the worst out of the 4 in Team Avatar.
Despite training more than anyone else in the show, his bending while great, still isn't the best. Meanwhile, Katara pretty much mastered waterbending from nothing in a couple of months. It led me to wonder "what's the difference between them? Why is Katara naturally more gifted than Zuko despite his genes being logically optimal for it?".
Then I realized something. Katara is a natural-born fighter, Zuko is not. Katara's not hot-headed like Korra and Zuko himself, but she is clearly just inclined to battle for justice. She is naturally protective, empathetic and caring, and willing to fight for it.
Zuko was not born to be a fighter I think. His kindness and empathy as a child is borderline miraculous under his family conditions, especially compared to Azula. Of course Ursa nurturing him to be kind and gentle has a lot to do with it, but the extra care Ursa shows to him compared to Azula is because of his nature in the first place. What's interesting is that while also has a strong sense of justice like Katara, it seems he has a level of pacifism and conflict aversion that she just doesn't. He stands up for people, but he's not naturally inclined to fight (at least as a child)
Zuko's conflict is so interesting because he's constantly fighting against his nature. He's good forcing himself to be evil. I know the fact that "Zuko is actually weak" is hampered to us during the show. His speech to unconscious Aang at the North, the flashbacks to his childhood with Azula outperforming him. But I never really internalized how he is just not built for this, how naturally gentle and kind Zuko is. It juxtaposes well with so many characters, like Katara I mentioned earlier. Iroh, who I could be wrong about but seems to be a case of learned kindness rather than natural (his son's death seems to have sent him on a journey of spirituality). Azula, who unfortunately never truly learnt kindness, (she either just wasn't naturally inclined to it, or her prodigal nature led Ozai to snuff out any gentleness from a very young age).
This natural kindness angle also contextualizes his obsession with honour. Clearly, neither Ozai nor Ursa indoctrinated him in the ways of "honour", instead favouring "strength" and "kindness" respectively. So where does this honour come from? An expression of both: The kindness he naturally evoked, which was protected and nurtured by Ursa, and the strength and resilience Ozai attempted to nurture in him. I think it's his inner self's way of expressing compassion without immediately being flagged as weakness. That's what I think Zuko's obsession with honour is.
I just think it's fascinating to write a villain turned hero this way. Not just a "evil guy who learns to be good", but a subversively good guy whose natural goodness is constantly leaking out.