Minus Skid and Pump

Minus Skid

 * Skid appears as a huge, ink-like skeleton-ish creature. His head is spherical and light gray, with a big, three-toothed smile reminiscent of a stereotypical cartoon skull's and white-pupiled eyes with black sclera.
 * In a sketch, Skid is capable of frowning and even shedding tears, despite having a skull-like head.
 * Skid's body appears lanky at the top half, but it slowly goes down and ends at a slimy, legless, presumably melted lower half. Around his torso are three ribs, with no visible spine or costal cartilage.
 * In-game, Skid appears to have only one long, bony arm with 4 digits, which is the one holding Pump. In another sketch, however, he has a second arm, implying he can grow and retract the extra limb if he wishes to.
 * Skid's fingers do not appear to move while he controls Pump, despite the latter being animated a lot more.

Minus Pump

 * Pump appears as a puppet with a completely orange pumpkin head and a big, open smile. His original counterpart's "bucktooth" is not present, and his mouth is trapezoid-shaped. His eyes have black scleras and white pupils, just like Skid's, except googly. He has 4 digits that are the same color as his head.
 * In the sketch with Skid crying, Pump keeps this facial expression even when getting chewed up by Pico, and his body goes completely limp when not getting puppeteered, possibly confirming he is an inanimate, lifeless puppet.
 * He wears a black fingerless bodysuit with a white pattern on the bottoms of the feet, making them look like sneakers. Each of the front of his bodysuit's legs has a single purple stripe going down from the knees to the mid-foot area.
 * Pump's wrists have purple strings wrapped around them, the left and right ones going up to Skid's pinky and index fingertips, respectively. This allows Skid to control Pump.
 * In the sketch with the two-armed Skid, Pump is drawn with more stitching even on his head, implying his whole body is made of fabric or a fabric-like material.
 * Pump is also somehow holding the microphone, making it possible that his fingers have the poseability of a rod puppet's, and that there are magnets inside of Pump's microphone and hands, allowing him to hold the former.

Trivia

 * Minus Skid and Pump are based on their original icons, like every other character.
 * Skid and Pump, unlike many other Minus mod characters, do not appear to be humans at all. Pump, however, has a humanoid body shape, whereas Skid is an ink-like skeleton commonly seen with only one arm (although he does have an extra one in a sketch).