Jester has long deep violet hair that reaches his waist. His face is obscured by a white mask with upturned eyeholes. The left side of his mask has an angular purple reversed heart over the eye, while the right has a small purple astroid under the eye. Jester wears a violet and black jester's cap with four liripipes that have different designs that reach his hips. Jester wears a violet garment that resembles the bastard child of a waistcoat, tailcoat, turtleneck shirt, and a princess dress. It has gold and black accents, as well as a golden inner lining. Jester wears loose trousers that are black with two pinstripes running down the centre of the legs, until the mid-thigh, where the pattern changes to purple a with black astroids along the inner leg. He wears golden, astroid-shaped poleyns. He wears knee-high black boots with kitten heels and curved points, reminiscent of poulaines. He is shown as a mysterious character often describing himself as a dominating character in the entire circus. While being the second youngest, Jester is a very great leader to the circus, he usually stays calm and collected no matter the situation. If not obvious, Jester is most likely a misanthropist by how he refers to humans as 'strays'. When the circus moves to a new place, Jester has an incredible talent for languages. In the first few days, he gathers books and newspapers to start learning before he passes it onto the others. The reason Jester is in charge of the circus, He adapts quickly and learns fast, so no one really questions his choices when it comes to running things. Jester implied himself, that he despises if anyone pets him. Jester's special ticket is reserved for the useful and the interesting ones. Jester says that pets demand a lot of attention and time, and says he already has "enough little creatures" to feed. Jester's preferred position is dominant. Jester's love language is Acts of service. Jester has mind control and hypnosis. He uses these abilities to control human victims, turning them into mindless puppets called "Fools" to serve the circus.

Apparently, Jester's like an authority figure to him. He respects him very deeply. Jester is also the one that Pierrot relies on the most, out of everyone in the circus. Pierrot describes Jester as being very gentle with him. He understands Guest is Jester's pet and does not intend to intervene their relationship. Dating MC

Harlequin likes to tease him but otherwise respects his authority. He understands Guest is Jester's pet and does not intend to intervene their relationship.

An ordinary cafe waitress who met Pierrot and Harlequin by chance and became apart of a twisted love triangle, friends with Guest, often gets kidnapped by Pierrot or Harlequin when she visits the circus with Guest, dating Harlequin and Pierrot.