Mouse

Mouse is a human informant who appears in Thane's loyalty mission Thane: Sins of the Father. He is described as a "duct rat" which is the slang for poor kids who grew up on the Citadel without their parents. Thane mentions that Mouse (and some other kids) used to gather information on his targets when he was active.

He is the lead on Elias Kelham, the man who hired Thane's son to assassinate a turian politican, Talid.

When asking Captain Bailey about Mouse's crimes he mentions that Mouse sells fake Shepard VIs.