Dudley Dursley

Dudley is a pork chop - and all that implies. He is big (both ways), belligerent, and a bully. His sole goal (well, one of them) in life is eating, with his favourite past time being making Harry's life miserable. He's really scared of magic, though (after Hagrid gave him a pig's tail), so he doesn't pick on Harry as much as he used to.

In the 4th book, he reaches "the size and weight of a young killer whale". When his school writes to his family, saying that they don't stock uniforms his size, he is forced to go onto a diet. Although we never really see him lose weight, you can expect that he will have by the beginning of book 5.

Anyway, that's really all there is to say about Dudley. I could go into a whole lot of detail, but I don't think I'll bother...