Loloshka

His skin is completely black, making his facial features almost indistinguishable—in fact, only one eye is visible, glowing bright red. He wears the Domino Crown, with an X on one of the dominoes.
Around his neck is a long, tattered red cloak. Domino-shaped pauldrons cover his shoulders. Two green chains hang from his wrists. His chest is transparent, a green tint, revealing the torso of a Skeleton. He holds a Daemonshank sword in each hand. Black and green flames emanate from his body and from his swords. His entire body appears to have been filtered in high saturation, making him appear unnaturally bright against his surroundings.

Here's how he's usually described: Skin: pale. Hair: light brown, cut short, with bangs slightly slanted to the left. Later, after "unbinding from Time," a gray streak appeared in the bangs. Eyes: brown (but in some story arcs, such as "The Heart of the Universe," when the character is infected with Skint crystals, the eyes change color to purple). Accessories: white headphones with black ear pads and blue inserts, as well as decorative blue glasses with black lenses - the eyes are not visible through them. Clothing: a white hoodie with a slight soft blue tint, black stripes on the puffy sleeves, and black laces. Around his neck is a black and blue checkered scarf (this is one of the most striking and memorable details of the image). On his feet are black pants with two dangling blue suspenders and light blue sneakers with white soles.