Mistborn: The Final Empire  - Brandon Sanderson

Vin. She has become one of my favourite heroines. I love how we perceive her sincerity, strength and self-awareness of her own vulnerabilities. We watch Vin develop, re-assess and change - a quirk of her personality which adds to the progress of the plot (capturing the Bildungsroman vibe). 

*I also think this would make a brilliant anime series. Just saying.