Proof that dip is canon

proof

Celestia Ludenberg (セレスティア・ルーデンベルク), also known as Celeste, is a student in Hope's Peak Academy's Class 78th, and a participant of the Killing School Life featured in Danganronpa: Trigger Happy Havoc. Her title is the Ultimate Gambler (超高校級の「ギャンブラー」 lit. Super High School Level Gambler).
Little is known about Celestia's childhood. Her constant lying makes it difficult to determine what is and is not real about her family. Celestia described her father as being of French nobility and her mother being a member of a German family of musicians, but Makoto Naegi presumed this to be false. She also stated that she was given the name 'Celestia Ludenberg' by her parents, but later, she reveals that her European heritage is also a lie. Makoto believes that she came from the capital of Tochigi Prefecture, Utsunomiya where she came to love its most famous food, gyoza, despite saying that it's "vulgar" and "malodorous." This hints at her hatred of the working class lifestyle she was born into in Japan.
Celestia had a cat named Grand Bois Chéri Ludenberg whom she spoiled and loved dearly. She taught him to enjoy eating gyoza and made it his favorite food, an example of their close bond. Grand Bois became a captive for Monokuma's first motive during the Killing School Life, which reveals that he meant more to Celestia than any of her living relatives.
Sometime during her childhood, she began to admire European royalty and started wearing Lolita clothing, adopting a slight Eastern European accent which slips while she is under duress (with English localization only) and changing her name to sound more German. As a professional gambler, Celestia's world appeared to be built on falsehoods, trickery, and manipulation, hence why she earns the nickname the Queen of Liars. Her goal was to earn enough money to buy an opulent European castle filled with handsome male servants dressed as vampires. It is unknown why Celestia adheres to Victorian morality, but she appears to loathe her past and her true self, a sign of the ordinary and common world she was born into.
Notable occasions where Celestia put her life on the line to win large sums of money include playing Russian roulette-style mahjong in the basement of a mansion with an old billionare and a silver-haired boy who possessed a considerable amount of luck. She defeated them easily and shocked the specators of the game. Celestia described this as one of her "fonder memories." It's implied that she enjoyed gambling because she loved the thrill of outsmarting others.

Not much is known about her life before she was scouted by Hope's Peak Academy as part of the Class 78th, under the title the Ultimate Gambler by Koichi Kizakura. The reason Celestia agreed to enroll in the 78th Class was the urge to achieve even more notoriety and success so she could quickly actualize her dream of becoming something like royalty herself.
In photos recovered by Makoto, Celestia is shown playfully attacking Hifumi Yamada. Little else is revealed about her relationships with the other members of the 78th Class, but it's hinted that Celestia had at least a few friends.
During The Tragedy, Jin Kirigiri, the Headmaster of Hope's Peak Academy, planned to seal the school building and let the students live forever inside the Academy. This was a misguided attempt to save humanity's final fragments of hope; Jin planned for the remaining students to help rebuild the world. The students of Class 78th agreed to his plan and sealed themselves inside the academy. Celestia was seen casually drinking tea while her classmates hurried to seal the doors. The students lived peacefully inside the building for a year without knowing that the Ultimate Despair was planning to destroy them.
Celestia was among over a dozen exceptional students chosen for Hope's Peak Academy's Class 78th. In the Killing School Life, she and her classmates ended up trapped inside the school. Due to Junko's memory wiping, everyone was unaware that they had already spent two years together prior to the tragedy.

Danganronpa 1 CG - Students at the School Entrance When Makoto introduced himself, he immediately questioned Celestia's name and identity. She reassured him that "Celestia" was indeed her real name. Makoto recalled reading a thread online that described her as a top gambler and an expert of deception, so he remained suspicious. Shortly thereafter, the students were forced to participate in the mutual killing game. The first motive to murder were DVDs with a video from Monokuma that implied their loved ones were in danger. Celestia's video showed her most beloved relative was her cat, Grand Bois Chéri Ludenberg.
After the students found out that there no way to escape Hope's Peak Academy on the first floor, Celestia sweetly suggested that they simply adapt to their new lives to prevent anyone from getting hurt. Taking leadership over the group, she decreed that no one should be allowed to go out of their dormitory at nighttime, which wasn't specified in the student handbook. Everyone agreed to comply with Celestia's rule to lower the odds of someone getting killed.

It was after the death of Mukuro Ikusaba disgused as Junko Enoshima that Celestia callously stated that those unwilling to adapt deserve to die. This showed she had no mercy for those who refused to follow the school rules, and that her empathy was lacking.
Following the events of the first Class Trial, the class convened in the Dining Hall in the morning to devise a plan of action. Celestia explained that the killing game was incredibly intricate, and that the mastermind must be extremely powerful to create technology as advanced as Monokuma and take over Hope's Peak Academy. Monokuma interrupted to tell them that other areas of the school were now open to explore, and so Celestia, along with the remainder of the class, started the search. However, they couldn't find an exit on the second floor. Once again, Celestia was cool headed and nonchalant, stating that she enjoyed their newfound freedom and that the occasional class trial wasn't so bad.

Danganronpa the Animation (Episode 04) - Male Bonding (051)The next morning, the class had their usual meeting in the Dining Hall. Celestia announced that she was thirsty and demanded milk tea from Hifumi. He hurried to bring her the tea, but she lost her temper when he failed to make it correctly. She shouted at him that he had added the milk after the brewing process instead of during it, which wasn't what she preferred. Celestia forced him to make it again, and the other students were shocked by this aggressive side of her personality.
After Chihiro Fujisaki's murder, and during the following class trial, Celestia was able to play a part in revealing Mondo Owada as the culprit, having encountered Chihiro in the storage room prior to his death. During their encounter, Celestia noticed Chihiro was holding a duffle bag with a blue tracksuit partially hanging out, which he stuffed back inside before going off in a hurry so she wouldn't be able to notice. Kyoko Kirigiri was able to force a slip of the tongue from Mondo, when explaining that Chihiro had picked out a tracksuit that matched the culprits. Mondo became concerned and stated having a black tracksuit rather than Chihiro's blue tracksuit however Chihiro's tracksuit color was not specified by Celestia during her testimony and she was then able to reveal after that it was in fact blue.
After Mondo's execution Monokuma revealed his next motive to prompt another murder: 10 million dollars in cash for whoever graduated from Hope's Peak Academy. Celestia, wishing to achieve her dream of owning a large European castle with many male servants, saw the perfect opportunity to win the money and escape the school. From a young age, she had bet her life on gambling in order to win vast amounts of money that could help her achieve her dream, and while she was successful, the amount of money she earned wasn't enough.
When the opportunity arose. she crafted her plan of action by kidnapping Alter Ego and hiding him in a locker. She then approached Hifumi, who had grown attached to the AI that Chihiro had made before his death, and was continuously in conflict with Kiyotaka Ishimaru over who deserved to spend time with him/her more.

Danganronpa 1 Hifumi becoming Celestias AccompliceShe explained to Hifumi that Kiyotaka had abused her physically and threatened her to steal Alter Ego, stating that he had taken obscene photos of her that he could use as blackmail. She further stated that in order to keep Alter Ego for himself, he was planning to murder Hifumi too. Hifumi, believing the lie, became enraged with Kiyotaka and was manipulated into helping Celestia's plot to escape the school.
Once Hifumi had become convinced, the two began to conspire. Celestia and Hifumi were able to trick Yasuhiro Hagakure into coming to the Rec Room and were then able to force him unconscious with chloroform. Once unconscious, they put him into the Robo Justice suit, a large robotic model made of cardboard, which Hifumi had made in order to cover any persons face and body as Celestia had specified, Hifumi then positioned himself to look as though he was being attacked by Robo Justice and Celestia began taking pictures on a digital camera in order to prove this as fact and to lay suspicion on Yasuhiro. Once Yasuhiro was of no further use, they shoved him into the Pool Room Locker to be discovered by the students later.

The next phase of the plan was to murder Kiyotaka, who was lured to the equipment room through a fake note made by Celestia explaining she may have discovered an exit to the school. Then, Hifumi, using the 4th of four "Justice Hammers" he made out of painted mallets from the Art Room, killed Kiyotaka with a fatal blow to head, and left the 4th Justice Hammer at the scene of the crime.

Danganronpa the Animation (Episode 06) - Justice Robo Attacks (20)Hifumi and Celestia then both faked being attacked by Robo Justice with Justice Hammer 1 (in the Rec Room) and Justice Hammer 2 (in the Library). Shortly after, Hifumi faked another attack with Justice Hammer 3 in the Nurse's Office, which resulted in his supposed "death".
He was able to fake his death by covering himself in transfusion blood from the Nurse's office and laying on the floor. The class presumes he is dead due to the body discovery announcement being sounded however this was only for members of the class discovering Kiyotaka's body.

A previously planned scream from Celestia allowed Hifumi to sneak out of the Nurse's office due to the attention being drawn away from him, this giving him time to move Kiyotaka's body to the Art Room with a dolly. The class, being notified that Hifumi had disappeared, left for the Nurse's office once again, which meant Hifumi could move freely around the 3rd floor. Once Hifumi had moved Kiyotaka's body, Celestia met with him in the Art Room to discuss their plan of action next. Celestia had convinced Hifumi that she was planning to kill someone of her own in order to remove suspicion on him however this was yet another lie, and their meeting in the Art Room ended in Hifumi's death. As he was celebrating his success, Celestia attacked him with a normal mallet from the Repository and left him for dead after giving him a blow to the head, joining the rest of her class.

Celestia's Fate
Celestia Ludenberg Halfbody Sprite (11)During the subsequent Class Trial, Celestia urged the students to declare Yasuhiro as the culprit to both the murder of Kiyotaka and Hifumi, given the fact that Robo Justice matched Yasuhiro's exact height and because the blueprints and suit parts for the model was found in his room. Hifumi's dying words also stated "Yasuhiro" was the one who had attacked him. However despite this incriminating evidence, Makoto wasn't so easily convinced, and, with the help of Kyoko Kirigiri and Byakuya Togami, was able to reveal the culprit due to two major factors:
Celestia had at oftentimes been the only one to see Robo Justice's movements, such as when it attacked her with one of the Justice hammers, when she spotted it heading for the 2nd floor and when she let out a scream to bring the students to the physics lab on the 3rd floor. It was at that point it became clear that Celestia had manipulated the situation for the purpose of allowing her accomplice, Hifumi, to move freely and put her plan into action. Her scream on the 3rd floor moved the class away from Hifumi's position, allowing him to scream from the Nurse's office and fake his death, which meant the class split into two groups, which Celestia herself had suggested. Once Makoto, Aoi Asahina, and Celestia had discovered Hifumi's supposed dead body, Aoi felt sick and was taken to the bathroom by Celestia while Makoto left to tell the others on the 3rd floor who had discovered Kiyotaka's body that Hifumi was dead. This gave Hifumi the opportunity to leave the Nurse's office and wait for the class to come back from the 3rd floor before leaving for the physics lab where he could move Kiyotaka's body.

When Byakuya and Sakura Ogami had returned to Nurse's office, Celestia stated the murderer was enjoying themselves, seeing the class helpless and that they would "be picked off one-by-one, just like those guys were.". This slip of the tongue proved Celestia knew about Kiyotaka's murder beforehand, as she mentioned two people. and referred to both of them as male.

Danganronpa the Animation (Episode 07) - Celestia's Breakdown (31)Celestia tried to convince the class that Robo Justice did have a hand in the murders in order to take the suspicions off of her, referring to the picture she took of Hifumi being dragged away. However, the suit itself didn't move at the waist meaning it was impossible that it could have dragged Hifumi away, rather it was balanced on his back. This proved that Celestia and Hifumi had partnered up when taking part in the murders. At this point Celestia had changed from being polite, presenting unusually rude mannerisms. Celestia reiterated Hifumi's dying words where he referred to Yasuhiro being his killer. However, Makoto still wasn't convinced that Hifumi was mentioning Yasuhiro, as Hifumi would always refer to those around him with their last name. While the name Hifumi mentioned didn't fit anyone else's description, Makoto requested Celestia reveal her e-Handbook profile, which she was unable to do. She eventually admitted to murdering Hifumi and involving him in her plan to make the case much more difficult to piece together.
Monokuma revealed her real name to be Taeko Yasuhiro (安広 多恵子), following her guilty verdict. Celestia did not show any remorse for the deaths of Hifumi or Kiyotaka as she stated following her dream to the very end was what was most important. Aoi and Yasuhiro did not understand why she wanted to commit murder when she was the one who preached having to "adapt" to their new lives. However, Celestia admitted she wanted to leave the Academy more than anyone and that she was simply lying, this was due to never being able to achieve her dream if she had to be trapped in Hope's Peak Academy forever.

Danganronpa the Animation (Episode 07) - Celestia returning Alter Ego's key (16)She stated wanting to die "gracefully" and be reincarnated as Marie Antoinette, not afraid to be executed however Makoto saw through her smile and realized she was indeed afraid, despite her natural façade in deceiving her own emotions. Before being executed, Celestia approached Kyoko for a final goodbye, giving her the key to the locker she had hidden Alter Ego in and stating she was unsure what kind of hope it could have given them. She then bid her classmates farewell, willingly accepting her execution.
Celestia is executed by being stood in front of a large crowd of Monokuma's, standing stationary on a large pile of flammable wood. Her execution, The Burning of the Versailles Witch, shares the same similarities to that of a Witch-hunt, something that seems to be preferred by Celestia given her love of the Gothic. A Monokuma lights the flammable wood with a flaming torch causing the fire to spread and surround Celestia, her choosing not to run. However, while the fire is enveloped around her, a fire truck appears from the distance and mounts a ramp in order to crash into her and kill her instantly.