Agena, of Japanese descent, was born in Honolulu, and began acting at the age of 10. She attended Mid-Pacific Institute preparatory school in Oʻahu, and Whitman College for one year as a drama major.
Agena married Shin Kawasaki in a helicopter over Las Vegas, Nevada on December 19, 2005.
Agena is best known for her role in Gilmore Girls, where she played Lane Kim, a Korean-American teenager who is the best friend of Rory Gilmore, one of the lead characters. Agena played this role despite being significantly older than her character, who was 16 at the start of the series, when Agena was 27. Agena has also played the role of Mearing's Aide, Mearing being played by Frances McDormand, in Transformers: Dark of the Moon. Agena also appeared in three episodes of Felicity as Leila Foster, a girl who comes to the lead character for assistance in acquiring the morning-after pill and participates in a protest when denied the medication. She was a recipient of the Best Female Actor award in the Ammy Awards, which honor Asian and Asian-American achievement in film or television. She also provided the voice of Yori in the Disney cartoon series Kim Possible in seasons 2, 3, and 4 of the show. Also, Agena played Jun Ni in the movie Hair Show starring Mo'Nique. She guest-starred on Private Practice, Castle, and episode 12 of the final season of ER. She also appeared in Private Valentine: Blonde & Dangerous alongside Jessica Simpson as an army private. In 2010, she appeared onstage in No-No Boy in Santa Monica, California. She later appeared in an episode of House as Dr. Cheng.

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