Jason Ogg's youngest, he has been described as possibly the stickiest child in the world (despite stiff competition from a young Wentworth Aching). This is largely attributable to living next door to his doting grandmother, Nanny Ogg, who keeps him supplied with candy. (Just imagine one of Gytha's daughters-in-law telling her "no sweets before dinner, Nanny"...)
Pewsey's training as a spoiled brat came in handy once, though. You can depend on him to come running at the rattle of a sweetie bag.