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The Skull Noise is predominantly black. Its teeth are in the shape of the skull that appears on the Player Pin from The World Ends With You, the blade is composed of two black metal pieces elongating from the skull to the hilt, between them is a purple line that quavers like a sound wave. The hilt is made up of two pieces of metal protruding from a circular piece that is red inside with the skull that appears on Beat's beanie. The guard is based off Neku's headphones, while the handle is black-gold. The chain, connected to a bell reminiscent of Rhyme's necklace, is a red lanyard with Mr. Mew, Shiki's cat doll, as the Keychain.
The Keyblade's name is derived from "skull," a common visual element in The World Ends With You, and "Noise," the collective term for enemies in the same game. Many Noise have limbs formed from hollow lines, similar to the design of the Skull Noise Keyblade.