Murderers

your partner and best friend, also a jester in a blue jester suit,

Hair: Long, silvery-white, falling from under a jester's cap.
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Mask: White, with black vertical slits for the eyes. Under the left eye is a black teardrop-shaped mark. This is a reference to the classic image of a sad clown.
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Eyes: gold or amber. The developer noted that yellow is associated with jealousy in psychology—this echoes Pierrot's reaction to the protagonist's interaction with Harlequin.
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Costume: Red and black, in the spirit of a traditional jester. The design features gold details: bells and yellow stars on the cap, a yellow lining on the collar, a pattern of "diamonds" (red and black) on the sleeves, and a yellow detail (possibly a belt) at the waist. He wears black, mid-forearm gloves, baggy knee-length pants with red inserts at the bottom, and long black jester boots with upturned toes, red soles, and yellow laces.

young woman
Hair: Curly, black, reaching to her cheeks. Two strands on the left side of her forehead are curled inward, creating the silhouette of a heart.
Mask: White, with upward-curved eye holes. On the left side is a green diamond passing through the eye, and on the right side is a green triangle pointing downward, below the eye. The mask almost always depicts a sinister, sharp-toothed grin, but the expression is not fixed: the smile can widen, narrow, turn into a grimace, or disappear completely. When the mask is removed, the eyes and the inside of the mouth (presumably the tongue) glow a poisonous green.
Cloth:
Hood: green and black jester's hood, with two pipes of different designs and bells at the ends.
Cape: black with gold lining, inserts, and backing; fastens at the neck with a gold strip. On the left side is an inverted heart, on the right a regular one.
Tunic: green, with two vertical black stripes along the left side of the body. In the center is a gold insert, bordered by black stripes.
Sleeves: left - completely black, except for a green stripe along the entire length; right - green with a row of black hearts along the length.
Gloves: The left hand has a green glove with black fingers and a black heart on the back of the hand; the right hand has a black glove with green fingers and a green heart on the back. Both have claws.
Trousers: Loose black with gold hearts at the middle of the front thighs.
Boots: Knee-length, flat sole. The left shoe is green with a black collar, black laces, and a black sole; the right shoe is black with a green collar, green laces, and a black sole.