Regular readers will know that I write in what I jokingly call the "kickass girl genre" -- action adventure with female protagonists that could beat you up. I often look to The Hunger Games and Graceling, two popular books with similar heroines, for inspiration and guidance. After spending some time with the books, you start noticing things.
For example, has anyone ever noticed that the main characters both have names starting with the syllable "Kat"? (Katniss and Katsa). Could be a coincidence, but I also wonder if there's something about the explosive sound of the letters "K" and "T" that conjure up an impression of forcefulness. Funny enough, my main character (conceived before I read either book) also has a "K" name -- Kyra.
Sound to meaning mapping in language has its supporters and detractors, but there have been some thought provoking results. Check out this interesting article from New Scientist for some more examples.