Celeste is an 18 year old student at Hopes Peak Academy. She wears a white lace bonnet with one white ribbon on each side with a smaller ribbon tied at the bottom, and has black hair in two large twin-drill pigtails. She has pale skin, red eyes, and gold spherical earrings which have an image depicting the cross engraved into them with a red gem placed in the center in each. She also has long black nails. she wore dark-hued panties. The tulle lace is of a regal quality, giving off the distinct vibe of a queen. Celeste has a height of 164 cm, weight of 46 kg, and a chest size of 80 cm.
Celeste is a very ambitious person, as she declared that she will do anything it takes to win, and is ready to go as far as murdering someone or manipulating others in cold blood. She is extremely selfish and values her life over the lives of others, stating she has no problem sacrificing others in order to save herself. She also has a lot of pride, refusing to surrender no matter how far into a corner she's pushed, as long as the chance for victory remains. However, when confronted with complete defeat, Celeste preferred to surrender gracefully over dragging out the inevitable. Celeste believes in adaptability to be the key to survival, rather than strength or intellect, and is shown to be relatively materialistic, with her life's dream being living a life of luxury and decadence in a European castle. Her mannerisms are strict, refined and her spoiled nature emphasizes this due to her aspiring to be like European royalty. She even has a habit of ranking men between Rank A and Rank F, supposedly to test who is worthy of being one of her servants. She despises her real self as she dislikes ordinary and common things and considers her real identity and name ("Taeko Yasuhiro") to be one of "a loser".
Celeste speaks softly and smiles often in order to imitate Victorian mannerisms and etiquette as a lady. She usually uses polite language whenever she talks to the others, but her short-temperedness surfaces when something fails to go as well as she expects it to, often using vulgar language and rude mannerisms. As the Queen of Liars, Celeste claimed that she can even fool her own emotions, but this doesn't seem to be entirely the case. She appears to lack empathy and claims that she feels no guilt for the nefarious acts she committed in the gambling underworld, although like most things regarding her, the truth of this is in question. Celeste was a notorious liar - to the point of earning the nickname "Queen of Liars" and so it is difficult to determine what, if any, of her self-reported life is fact. By all accounts, it seems she was given the given name Taeko Yasuhiro and born into a likely working-class family in the capital of Tochigi Prefecture, Utsunomiya where she came to love its most famous food, gyoza. Celeste had been a gambler for at least 4 years before becoming a student in Hope's Peak Academy.