When we watch a Shakespearean play or read an Austen novel, one thing that inevitably stands out is the characters' distinctive voices. Tony Stark’s snappy quips and Steve Rogers' stalwart proclamations in the Marvel Cinematic Universe are a testament to the power of a well-crafted character voice. It's the rhythm of their speech, the idiosyncrasies of their diction, and the essence of their thoughts that make us believe in them, root for them, even love them. And in this grand dance of character creation, our AI co-authors are our eager partners, as long as we lead them well.