|4 feet long, yellow rims around eyes, yellow ‘V’ on forehead, yellow fur on underside, four arms with no claws, red teeth, and ghost-like tail.|
His voice is a little like Stitch, but more maniacal. Cannot speak English very well. He is mischievous, but has a sense of loyalty towards his ‘sister.’ His friends are Mayhem, Richter, Stitch, Lilo, Keoni, Victoria, Yuna, Ani, Angel, Leroy, Sheila, Beam, Reuben, Jumba, Pleakley, Scrump, BooGoo, Dark-End, Suno, Blacke, Mamf, Evile, Sparky, All of Experiments, and All of Us. His enemies are Delia, Gantu, Hamsterviel. He likes causing chaos, but once he gets the hang of it—being able to ‘destroy’ things for good. He dislikes/fears the dark, people endangering Mayhem.
The first participant of this brother-sister team of destruction, Mass’ primary function is to cause whatever damage he can to the surface of whatever planet he is currently on. Because of his ghost-like function, Mass can become one with the ground, therefore controlling what it does. Somewhat like Experiment 375, Phantasmo, only much more deadly. According to Jumba, Mass and his sister, Mayhem, were two of his finest work. What they lack in physical strength, they make up for in their telekinetic ability. Which is why they were very difficult to catch. Actually, it was Experiment 513, Richter, who helped capture Mass. Because he can create earthquakes, he somehow managed to trap 681 under the ground. Jumba says later that it is because of their unique eyes. Without light, Mass and Mayhem cannot function. So, Stitch dug him out, after blindfolding him.
Richter’s predecessor, he was created to work alongside his ‘sister,’ Mayhem, in destroying a planet via ‘natural’ disasters.
Mass was made shortly before the destruction of Jumba’s first laboratory (of which Mass and Mayhem were a part of.)