He is extremely compassionate, selfless, and always striving to help other inphernals with anything that he can. However, this kindness can sometimes be taken advantage of by others. Despite his altruism, he feels as though he doesn't do enough for others. He struggles with self-worth and self-respect, valuing others above himself, even if it's to his own detriment. He has two green horns protruding from both sides of his head that curve up and point inwards, with 2 grey rings on Boombox's right horn and one on the left. Around the start of the horn, two light grey rings are connected to the visor and horns. On the visor are two green glowing circles, resembling eyes, accompanied by a bracket shaped mouth right below. He wears a backwards dark green cap with a light green stripe and a gray brim. He wears a green shirt with rolled up sleeves, alongside a darker green tie. On his chest, he has a strap across his chest from his shoulders, which are a dark green. Boombox wears green gloves, with a thumb hole on both. Boombox's pants are dark green with a metal chain on his right leg. On his left leg, he has a double-outlined lime green star design. His namesake gear, the Boombox, is grey, with neon green accents throughout it.

Skateboard is a laidback, but playful and easily restless inphernal. He always needs to be moving, and is down to do just about anything he deems fun, lest he get bored. Though he can be flighty, he values his loved ones more than anything, and will put his life on the line to protect them. Skateboard wears a typical skating helmet, with a singular checkerboard stripe down the middle, outlined in gray. On the right side, a crimson Playground logo is printed. Both sides of his helmet have openings for his horns, with a grey shell. Skateboard has red horns that taper upwards. He wears a red hoodie that transitions into a maroon gradient, the sleeves rolled up to his forearms. The hood is black. His hoodie has a skull with a sunglasses and halo printed on the front. Underneath the hoodie, Skateboard wears a dark red undershirt with sleeve garters on his left arm. Around his waist, he wears a black belt with a silver buckle. Skateboard wears black camo pants and red shoes with a white tongue and vamp. He wears a crimson backpack with gray zippers, with spray paint and a chip bag hanging out. Skateboard's gear is a typical skateboard. Around the sides, the gear is outlined in red, neon. Below the board, four wheels are attached, which are a vibrant red.

Coil is an unserious person who typically acts only in his best interests. He will rarely take anything seriously, often teasing and messing with other inphernals in order to get a reaction out of them. He loves the feeling of schadenfreude that comes with seeing misery befall others, but would never seek to harm anyone himself. Despite his "devil-may-care" attitude, he is extremely intelligent, as evidenced by his experimentation on his own gear. His horns start on his forehead and curve backward, before curving again in the opposite direction and tapering upward. His horns are two different colors: the left is orange, and the right is light blue. His right horn has a bright chunk of crystal embedded in it, forming cracks within the horn. He has a small band-aid across his face, accompanied by an expression that conveys an assertive demeanor. He wears an orange hoodie with light blue drawstrings and a white Cerberus design on the back. The sleeves of his hoodie have been ripped off, leaving messy fabric where they were torn. He also wears slightly baggy gray pants with a light blue waistband and a pair of orange straps hanging on each side, connected by light blue buttons. The lower half of his pants features a light blue lightning pattern. Finally, he wears mismatched sneakers: orange on the left and blue on the right, both with white tips. His arms are wrapped in bandages, with two blue metal bands worn around each one, and glowing coils of electricity encircling both arms. Glowing tubes are directly connected to his arms, starting from his fists and curving up toward the back of his shoulders.