Being comfortable isn't the way to learn to expand your abilities.
I do like to explore evil characters in my books.
I don't consciously do anything to maintain a unique voice.
I do have to earn a living, so I'm conscious of probable reactions from readers, but the most important one is still the awareness that if I'm not enjoying a story, the reader won't either.
I do try not to spend much time reading in the suspense genre.
Reading a novel in which all characters illustrate patience, hard work, chastity, and delayed gratification could be a pretty dull experience.