The Ultimate Gambler!

As an experienced gambler, Celestia appears collected, cold, and cunning by nature. She possesses the ability to manipulate others to do her bidding and can lie with a perfectly straight face, this is shown when she is able to manipulate Hifumi to make her royal milk tea and further be her accomplice during Chapter 3. She is shown to be fairly intelligent, referencing several aspects of game theory such as Prisoner's Dilemma or Zero-Sum Game, and her manipulative and coercion skills are shown in Chapter 3, being able to deceive the majority of the students, including Byakuya up until the class trial. Her intelligence is also shown in previous cases in which she, alongside Kyoko, Byakuya, and Makoto are the ones to bring up crucial points and is also capable of keeping up with Byakuya and Kyoko's train of thought during the trials as well.

Celestia 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, Celestia preferred to surrender gracefully over dragging out the inevitable.

Celestia believes in adaptability to be the key to survival, rather than strength or intellect, and she acts upon this by setting up measures such as the voluntarily imposed night-time curfew to protect the other students, as well as herself, from potential killers during the Killing School Life. She often reminds others to obey the curfew and is often annoyed when people such as Byakuya Togami violate the curfew, showing her authoritative and commanding nature. After the death of Chihiro, she coldly remarks that people who disobey the rules pay the price. In reality, she was lying about having to adapt and more than anyone wanted to leave the school, showing how easy it is for her to hide her emotions.

Celestia is shown to be relatively materialistic, with her life's dream being living a life of luxury and decadence in a European castle. Monokuma's third motive appealed to Celestia and caused her to put a murder plot into motion. She was also the only person unable to view Alter Ego as a person or friend, which ultimately contributed to her decision of seeking escape through graduation.

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 people between Rank A and Rank F, with her not caring for anyone who is a D-rank and despising those who are F-rank. She despises her real self as she dislikes ordinary and common things and considers her real identity and name to be one of "a loser". Celestia speaks softly and smiles often in order to imitate Victorian mannerisms and etiquette as a lady. She even uses the extremely polite and formal Japanese pronoun watakushi (わたくし), emphasizing the typically polite and formal way in which she speaks to the others. However, her short-temperedness surfaces when something fails to go as well as she expects it to, such as when Hifumi fails to make her royal milk tea as she likes it. Another example is during the third Class Trial when she's accused of being blackened, Celestia quickly lost her composure after being accused of murder. She shouted and denied accusations towards her with unusually rude mannerisms, often using vulgar language. In the English dub, her normal European accent also begins to falter as well.

To further keep up her Western masquerade, Celestia often does things such as using the Japanese transliteration of the English "gambler" (ギャンブラー), instead of the Japanese term "shōbushi" (勝負師) and claiming her parents are of European ancestry.

As the Queen of Liars, Celestia 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. Despite her status as a consummate liar, before she was executed, she presented a smile, but Makoto was still able to recognize her fear within. Celestia has a habit of deceiving her own emotions and so even in defeat always keeps a constant poise.

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