Amita Ramanujan, Ph.D., is a fictional character from the CBS crime drama Numb3rs, played by Navi Rawat. Over the course of the series, she has become a professor at CalSci and has since become romantically involved with her former thesis advisor, Dr. Charlie Eppes. She was first introduced in "Pilot". She also works as an FBI consultant with Charlie and Larry.

Charles Edward Eppes, Ph.D., is a fictional character and one of the protagonists of the CBS crime drama Numb3rs. He is portrayed by David Krumholtz.