[1] Maruyama has appeared on television in supporting roles in a number of sitcoms, including recurring characters on The Jamie Foxx Show, Strip Mall, Suddenly Susan, and Arrested Development.

[1] Maruyama is well known as an improv performer and instructor, and was a featured guest on the American and British versions of Whose Line Is It Anyway?, as well as being a member of The Groundlings.

[1] She is part of the cast of The Jim Henson Company's live stage show "Puppet Up!

- Uncensored"[1] which has toured to Aspen, Las Vegas, Edinburgh, Sydney and Melbourne and is currently appearing monthly at Avalon Hollywood.

[3] She also appeared as a non-celebrity contestant on the 1984 CBS game show, Body Language, under the name Karen Upshaw, saying she was from Perris, California.