Fleet is the Genius loci of the River Fleet. She is the daughter of Mama Thames. She looks like she's in her 30's, and is said to be built like a sprinter with broad shoulders and a narrow waist.  According to Beverley Brook, Fleet is married to a fae and has got "like a gazillion foster kids". The children are adopted.
Before becoming FleetEdit
The earlier FleetEdit
Before the Great Stink in 1858 there was a son of Father Thames called Fleet, who perished in a flood of filth and muck.