Diastema could be a distinguishing feature in a character for a short story or novel. Diastema is the space between the upper front teeth.
Some celebrities have diastema, Madonna, Woody Harrelson, Jack Black, Elton John, Brigitte Bardot, Michael Strahan, Condoleezza Rice, LeAnn Rimes, Ron Howard, Eddie Murphy, Samuel L. Jackson, Rhea Perlman, Seal, Ernest Borgnine, Arnold Schwarzenegger, Rob Reiner, 
David Letterman, among others.
I’d like to use diastema for one of my characters. I’ll think about which one.
