Abby Sciuto

Abigail "Abby" Sciuto (pronounced /ˈʃuːtoʊ/) is a fictional character from the NCIS television series by CBS Television, and is portrayed by Pauley Perrette. Abby was introduced in the episodes "Ice Queen" and "Meltdown" (which together served as the backdoor pilot for NCIS) in the television show JAG, and has appeared in every episode of NCIS, in addition to being featured on the show's spin-off, NCIS: Los Angeles.

Abby is a forensic specialist at the Naval Criminal Investigative Service headquarters at the Washington Naval Yard and demonstrates mastery in a large number of areas of criminalistics, including ballistics, digital forensics, and DNA analysis. Special Agent Tony DiNozzo describes her as "a paradox wrapped in an oxymoron smothered in contradictions in terms. Sleeps in a coffin. Really, the happiest goth you'll ever meet."[1] Her gothic style of dress and her interest in death and the supernatural enigmatically contrast with her generally hyperactive demeanor and enthusiasm about her work.

Reference: http://en.wikipedia.org/wiki/Abby_Sciuto