Dummie has a small, friend-shaped body, consisting of spherical hands and a round head, based off of the appearance of a short Heumannish (albeit slightly chubby). His head consists of three things: stitching around the side and top of his head, a zipper on the back, and two beady eyes in the center of his face. It's worth noting that Dummie has absolutely no mouth, and in turn has to rely on a wide range of facial expressions with his eyes and other movement to get his point across if he isn't able to write anything down.
Dummie commonly wears an orange shirt and teal shorts, which was on the testing dummy since the beginning. While he could change into a different outfit, a quick shirt and shorts are the most comfortable, and the most flexible when out and about. His dark orange shoes were bought by Frank as a gift when they became friends.

Dummie has a lot of child-like innocence when it comes to his personality. He's curious, explorative, learning, and warm-hearted... albeit with a slight temper when provoked enough. Suffering from a slight bit of shyness, Dummie will often stick to those he trusts and form good bonds with. Despite the child-like behavior however, Dummie also comes packed with determination to get what needs to be done, done. Whether its from helping Frank from a situation, stopping some foe, or just something fun, Dummie will do whatever he can to see it through.

Off in the middle of a desert, there once was a testing dummy facility put in place. Here, testing dummies are both created, tested, and sold off to other companies. One night, when everyone least expected it, a wandering soul had managed to drift into the building. (Wandering souls are essentially souls of the deceased invisible to the naked eye, drifting in a purgatory-like state until it either gains the willpower to possess something and lose all memories forever to be reborn, or fizzle out of reality. Not many last long when in this state.) The soul traversed the facility, completely aimless and bouncing off of walls until it falls into a corner of rejected testing dummies. Without hesitation, the soul collided with a dummy that was about to be tossed due to overweighted stuffing, springing it to life.
Of course, in doing so, set off major alarms for all of the workers during the night shift. Everyone's first instinct was to grab the testing dummy that just came to life in order to run tests on it, whereas Dummie, just now catching wind of the situation, needed to book it out of there. It was close, almost cornered and caught multiple times, but Dummie had managed to flee the giant factory and off into the desert outskirts, much to the workers' dismay.
Stuck on his own for a while, now grasping his situation, Dummie was left to wander around a desert for days, maybe even weeks. That was, until he found a strange person and a giant chunk of flying land. Frightened, but without much other options left, Dummie proceeded to approach the person for help, and maybe to cure some of his loneliness. Granted, it was awkward for him to communicate with no mouth, but he still got the job done. That's how Dummie met Frank.
Before you know it, the two hit it off as friends, and formed an unbreakable bond. After a bit, Frank then began to hop back onto the floating island to get out of the desert after taking care of a quick pitstop, with Dummie secretly following right behind him. After a while of hiding around the place, Dummie was eventually found, and offered to stay with Frank.