Clarke's impact is fascinating because she functions less as a traditional hero and more as a moral and logistical pivot point. In a story where survival is paramount, her medical background shifts the focus from brute force to triage, both physical and ethical. The narrative constantly forces her into these impossible 'lesser evil' choices—culling the 100 to save the Ark, sacrificing Mount Weather to save her people. That's the core of her role: she embodies the unbearable weight of leadership in a collapsed world.
I think a lot of post-apocalyptic stories default to a lone wanderer or a warlord archetype. Clarke disrupts that. Her leadership is communal, agonizing, and deeply fallible. She's not the strongest fighter, but her decisions are the engine of the plot, creating ripples that define conflicts for seasons. Without her, 'The 100' would just be another faction war; with her, it becomes a relentless examination of what you're willing to become to ensure your people live another day. The show's central question—'What's the cost?'—lives and dies with her choices.
Honestly, my favorite aspect might be how she makes you, as a viewer, complicit. You root for her, then you're horrified by her, then you understand why she did it. That messy, flawed, necessary role is what gives the post-apocalyptic setting its grim, philosophical teeth.