Biographical studies of Penny Pig-
"The Adventures of Paddy and Penny Pig: part 1, Life on the Farm." By John Lusk.
And here is a portrait-
Penny Pig
Penny Pig in her 'country come to town' garb-
http://www.etsy.com/view_listing.php?listing_id=19841645"> Penny Pig
Something about her childhood-
Peter Patty and Penny

Is Penny Pig Percy's mistress?
Some think so. "What a porky slut! She has jaundice for starters..."
(found at engineroom blog site).