I've read so many 'Legend of Zelda' fics that frame Link's growth as moving from 'the hero' to a person. So many authors latch onto the silence thing, right? But the good ones use it. It becomes less a gimmick and more a core part of his trauma—how do you process saving the world over and over when you can't just talk about it? I've seen brilliant stuff where his development is through sign language with Zelda, or through his cooking, or just the way he watches over the people in Hateno Village after the Calamity. It's in the small choices, the refusal to put the Master Sword back, the way he might adopt a cucco and just... keep it. The sword and shield are tools, but his development is in deciding what to protect when he's not being told.
Some fics go the reincarnation angle, which is messy but fascinating. Like, is he the same soul building up memories, or is each Link a blank slate? I read one where a modern-day Link starts having dreams of the Hero of Time's life and it completely wrecks his sense of self. The development there was about integration versus erasure. Honestly, the fanworks that ditch the 'chosen one' plot entirely and just have him running a stable or being a traveling blacksmith often show more character depth than some official materials. You see the weariness of the cycle, and the quiet rebellion in choosing a simple life, which in its own way is a huge step forward for someone perpetually destined for war.