Cybelle (Japanese: シベール) is a French-singing Mars' Brightest contestant with a dangerous obsession over Tuesday.
She is very tall and has a slim figure. She has pale skin and green eyes, and her hair is short, which she puts some strands of hair behind her ears.
She dresses herself up kind of tomboyish, with a oversized turtleneck white t-shirt and a pair of trousers with suspensers. She wears a gray pair of sneakers with oversized white socks. On her left ear, she has a blue earring.
When she was trying to disguise herself not to be discovered, she wore a black hat.
She is extremely obsessive towards Tuesday and anyone who aren't her are ignored.