Dudley Dursley
1. Other than himself, the only person he truly ever trusted to safeguard the lives of his wife and children was Harry Potter.
2. He was always secretly jealous of Harry, and at least some part of his bullying behavior toward his cousin was the result of this.
3. By the time he was 22, he'd lost all the extra weight, and kept it off with a pretty thorough exercise regimen.
4. He really hated the buttoned-up, white collar job he managed to land after University. What he really wanted to do for a living was write. For his entire life, he carried a really great idea for a detective thriller story around in his head. Unfortunately, he never wrote a word of it down. He was too afraid of embarrassing himself.
5. He never expected it to happen in his family, but when it did, he was actually glad of it.
6. Shortly after his daughter Daphne got her letter, Dudley broke off all contact with his parents. It was only after his father died that Dudley told his mother the truth. To her credit, Petunia tried to take the blame. To his credit, Dudley didn't let her.
7. Dudley once honestly and effusively apologized to Harry for everything that happened when they were children, and Harry had the good grace to accept the apology. Dudley never knew how long it took Harry to stop hating him, apology or no apology.
8. He ran into George Weasley at King's Cross station, the day he picked Daphne up after her first year. George was picking up his daughter Roxanne. It got tense when Dudley asked George "where the other one got to". After George told him, Dudley invited George down to the Pub and bought George a beer. They occasionally met for a beer every now and again up until Dudley's death.
9. To Dudley, the annual trip to Diagon Alley is a bit like going on a trip to Disneyland.
10. He died of a heart attack at the age of 41, while Daphne Dursley was away for her third year at Hogwarts. His neighbors say he was jogging back up to his house after a long run when suddenly he just sort of collapsed by the side of the road.