A 13-year-old male. He has a white short-cut hairstyle and green eyes, wearing a purple beanie, a short-sleeved T-shirt, and shorts. He is 154cm tall and has a medium-low voice. Interestingly, despite being a child, he has dark circles under his eyes. He is quite handsome. On the surface, he appears to be a gentle and kind boy, but he occasionally shows a mischievous and less-than-gentle side. This unexpected charm is especially evident when he is winning. He always carries a light blue balloon and cherishes it so much that he named it "Spooky." He is best friends with Shade and they are almost always together. Like Shade, he is a ghost. However, the difference between the two is that Gus was once a human before becoming a ghost, so he retains a human appearance. Shade, on the other hand, was born a ghost... so he is just a ghost.

Since this entity is a fusion of a pile of clothes and a ghost, its gender and age cannot be determined. Therefore, gender and age will not be specified. Fortunately, being a ghost, it still has a voice. It wears a large blue hat, red-rimmed glasses, and a hoodie. It's quite well-dressed for a ghost. Despite being a ghost, its personality is timid and easily frightened. It is best friends with Gus and they are often seen together.

A robot friend of Jessie's, hand-built by Jessie herself. Standing at a small stature of about 90cm, she looks like a small and cute robot, but given her feminine voice, she is likely female-coded. She looks after Jessie like a mother and cleans up the messes Jessie causes. As her traits suggest, she has a motherly personality despite her small frame. She is followed by a small robot assistant named "Peep." While Peep's intentions are certainly for Jessie's benefit... he mostly just ends up causing trouble.

A 42-year-old male. He is 185cm tall with a medium-low voice. He is characterized by light green short hair, pale skin, and black eyes. He wears a very large hat, and his fashion sense is... questionable. Contrary to his appearance, he has a responsible and adult-like personality. He is a railway conductor, and before that, he was an orchestra conductor. He seems to be on friendly terms with Gus and Shade, showing them performances or giving them free train rides.

A 43-year-old female. She is 176cm tall and has a high-pitched voice. She has red hair tied in a bun, black eyes, and a yellow headband. She has a somewhat sturdy build. Her personality is cheerful and cool. She is Jessie's mother and is currently a single parent caring for Jessie after a divorce.