He lives in a flat in London, and drives a yellow (stickshift) car, license number TC 123; he is a truly terrible driver. He loves books (he cannot seem to stay out of used-book stores), and will not let people put books down open-faced. He is quiet and soft-spoken, but can be surprisingly strong-willed. As a boy, he went to Wilton College in Middleton; although he hated it, he seems to respect their music program. He knows a good deal about horses, and used to do a lot of photography, although he claims to have lost the knack. He also seems to enjoy writing stories.
His hero name is Tan Coul. His heroic ability is strength. His assistant hero-in-training is Hero.
Polly initially gives Tan Coul another, more quotidian identity: in between heroic events, he is Thomas Piper and runs an ironmonger's shop in Stow-on-the-Water, where he is bullied by his stingy sister Edna and her sulky son Leslie.
See also Fire and Hemlock (spoilers).