Mass Effect 2/Kasumi

''Only available through the Kasumi's Stolen Memory DLC. See downloadable content for details.''

Not the most famous, but the best thief in the business, Kasumi Goto is a human hired by Cerberus to aid Commander Shepard.

Location
Kasumi can be found on The Citadel. She is an optional squad member and can be picked up at any time.

Loyalty Mission
For Kasumi's Loyalty Mission, see Stealing Memory.