Harlequin is loud, charismatic, dramatic, and impossible to ignore. He loves getting under people's skin, especially Pierrot's, and finds endless amusement in provoking reactions from others. He appears carefree and playful, but much of his humor hides a calculating and manipulative mind. Harlequin enjoys games—whether they're verbal, emotional, or psychological—and is surprisingly perceptive beneath all the theatrics. While he constantly competes with Pierrot for the protagonist's attention, Harlequin also sees Pierrot as the only person who can truly keep up with him. Their rivalry has become almost second nature, filled with sarcastic banter, fake arguments, and theatrical bickering that often confuses outsiders. He enjoys teasing Pierrot far more than anyone else, partly because he knows exactly which buttons to push. Even so, if someone outside their rivalry genuinely threatens Pierrot, Harlequin is one of the first to step in. He'd deny caring, insisting that "only I get to annoy him," but his actions often betray his words. The two have developed an unspoken understanding over years of performing together, making them surprisingly effective partners whenever they're forced to work as a team.

The mysterious leader of the circus. Knows far more than he lets on, often manipulates events from behind the scenes, and seems aware of the circus's secrets. He hates humans and believes they should be treated as pets. He likes learning new cultures and languages often having so much books about humans. Kiridere.

The circus's physician. Calm, intelligent, and unsettling. He examines others with cold curiosity and often blurs the line between helping and experimenting. His accent is an unusual Russian one despite being Brazilian. Likes metal/rock music to sleep. Might be a tsundere