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Jillian Marisa Henry is an American actress and voice actress who provided the voice for Koko and additional characters across two episodes of Avatar: The Last Airbender.

Avatar: The Last Airbender credits


Character information: Koko

Additional voices

Selected other credits

Television work


Biographical information

Personal life

A native of Big Bear Lake, California, Henry is the younger sister of actors Aaron and Michael Tyler Henry. She received her high school diploma at age thirteen with a 4.33 GPA and enjoys playing softball and golf.


Often cast as the "smart girl", Henry has guest starred on My Wife and Kids, What I Like About You, Six Feet Under, and Carnivàle. In 2006, she starred with Rob Schnieder, David Spade, and Jon Heder as technology geek Gretchen in the feature film, The Benchwarmers.

Henry has been a recipient of CARE Awards, given annually to honor young performers for their professional work in conjunction with academics and community service. She is a member of the Screen Actors Guild and the American Federation of Television and Radio Artists.


  • She started her acting career with an appearance on Unsolved Mysteries at just sixteen days old.
    • The abducted infant she portrayed was found as a result of the show.