Oogie

Before becoming the bag of bugs that we know him as today, Oogie started off having his own humanoid body. Even though his body appeared human, his skin was an artificial mesh and his insides are still stuffed with bugs. After time and decay, the bugs started to eat through his dead/fake flesh, causing him to continue to add parts to his suit in order to contain his fleeing bugs. Because of his problem, he was given the nickname “Buggie”, which he despises.
Oogie’s one wish is to be Pumpkin King, just like his rival/friend Jack. Every Hallow’s Eve (Halloween) he is forced to stay on the moon and away from the action, for the townspeople fear that, if allowed to roam freely, he would cause a catastrophe. Due to his appearance not being as intimidating as others, he must rely on his brains and inventions (Which he is quite good at making due to the fact that he makes his own gambling equipment to feed his “obsession”). The people of HalloweenTown fear his new and eccentric ideas, which leads to them denying him much action during their cherished night.
After witnesses a group of trick or treaters one Hallow’s Eve, Oogie gets an idea for a new invention, which, combined with another side effect of his bugs, will eventually lead to his ultimate downfall.