User blog comment:Marcyrulesforever/WADDLESSSSSS!!!!! WHY FAVE CHARECTER??/@comment-5335438-20130623012233

Waddles' helped develop Mabel's personality and has brought out sides of characters we probably wouldn't have seen if not for him.

For instance Waddles has a deep relationship with Mabel, and didn't disappear after The Time Traveler's Pig like I thought he would. The storyboard artists and writers put him in episodes for a reason. What is that reason? BECAUSE HE SHOWS DEVELOPMENT IN CHARACTERS. Mabel's development with Waddles is, for instance, a friend. Waddles' appearance shows how Mabel treats her loved ones when she has a deep relationship with them.

Also STAN.

Stan's dislike toward Waddles was the main plot of Land Before Swine. At first, Stan is reluctant to watch Waddles, which causes him to be snatched up by a dinosaur. Waddles' and Mabel's relationship caused the group to search for the pig, and eventually, Stan to fight a dinosaur to protect Waddles.

Also SOOS

During Carpet Diem, Soos shared a generous moment when he said how good it was to be a pig. The two body swapped, and eventually Soos learns it isn't.

They writers but Waddles in these episodes because of the development they bring in characters, and the plot possibilites he brings.