Bat, an acrobat at the circus, was smitten with Regina, and the two would often play practical jokes on each other. One day, Regina decided to cover Bat's scarf in pepper as a joke, so that he would sneeze. Later that day, when the two were playing while Regina rehearsed her lion taming with Léon the lion, Bat made a bet with Regina; if he could put his head in the lion's mouth, then she would have to go out on a date with him. Unfortunately, as he placed his head in the lion's mouth, he stirred up the pepper in his scarf, which caused the animal to sneeze and close his jaws on the unfortunate young performer. Due to being unaware of the pepper, the other performers later stated that Léon seemed to be smiling as he bit down on Bat; the animal was just reacting to the pepper. Bat's older brother Acro desperately tried to save his sibling, but lost the use of his legs in the struggle and Bat ended up in a coma. Regina did not understand the seriousness of Bat's condition, thinking he was only sleeping. This caused Acro to develop a deep resentment towards her. Léon was put down by the ringmaster shortly after the incident in an attempt to cover it up.
Six months later, Regina had stolen the hearts of two of her fellow performers: Max Galactica, the flamboyant circus magician, and Benjamin Woodman, the shy circus ventriloquist. Both men professed their love to her on the same day, although since the shy Woodman had done it via the puppet "Trilo Quist", Regina thought it was the puppet who was in love with her, not the man.
Regina later found a note that Acro had slipped in her pocket telling her to be at the lodging house plaza or her "secret" would be exposed. Thinking that the note was meant for someone else, Regina posted it on the cafeteria notice board. That same night, her father was found murdered in the very place the note mentioned. Since Max Galactica was the only member of the circus without a solid alibi, he was accused of the murder and took on Phoenix Wright as his defense attorney.
Wright investigated the case, first meeting Regina in the circus's Big Top when her tiger Regent tried to "play" with him. Wright eventually uncovered that the true murderer was Acro. It turned out that Acro's resentment and anger towards Regina for her naivety had reached the point where he had decided to kill her. His plan was to lure Regina to the lodging house plaza underneath his room, and when she was in position, he would drop a bust of Galactica on her head, killing her. Unfortunately, the very naivety that had infuriated Acro destroyed his plan. When Regina had put the note Acro sent on the notice board, it was found by her father, who knew what it was about, and went in her place. Since Acro could not see very well out of his own window, he mistakenly killed Russell, who had been like a father to him.
When all that had transpired was revealed in court, Regina was shocked and upset, finally realizing the seriousness of both Bat's coma and her father's death. She then blamed herself for everything that had happened and burst into tears. Regina later resolved to stay by Bat's bedside until he awoke from his coma, in Acro's stead.
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Regina eventually began to take on more responsibilities at the circus, although she continued to refer to her late father as its ringmaster and leader. At some point, she hired a man named Sōta Sarushiro, whom she tasked with the various logistics of their shows. In 2019, the two performed an animal show at a local prison, with said show involving a love story between Regent and an elephant named Dali. Sarushiro played a villainous monkey whom Dali would blow away in the climax of the story.
However, after the show, Sarushiro was accused of having committed a murder at the prison. The victim was a childhood friend of his called Manosuke Naitō, who had recently been arrested. Regina helped prosecutor Miles Edgeworth with his investigation by providing information on the animal show, parts of which turned out to have been manipulated. Eventually, Edgeworth revealed the true killer, prison warden Marī Miwa, and Regina helped extract the murder weapon from Miwa's pet alligator Ally. Sarushiro was set free, and both he and Regina thanked Edgeworth for saving him.
Miwa's trial took place about a week later. Regina and Sarushiro came to the District Court to watch the trial, though they were late due to Sarushiro being busy. However, they found that the prosecutor for the case and the evidence against Miwa had gone missing, and that the judge's son had been kidnapped to coerce her into acquitting Miwa. Regina and Sarushiro headed to Sunshine Coliseum to look for the missing prosecutor, although it would be Edgeworth who would eventually find him.
Not long after, Regina returned to the circus with Sarushiro, where they were soon confronted by Edgeworth and his associates. To Regina's shock, it turned out that Sarushiro had orchestrated and committed several crimes, including Naitō's murder and aforementioned kidnapping. Edgeworth accused Sarushiro of being the middleman between Naitō and Ryōken Hōinbō, which had ultimately led to the former's murder. Sarushiro challenged him to find a single shred of evidence to support the accusation, to which Edgeworth struggled. However, Regina produced a late letter from Naitō to Sarushiro that she had received the previous morning that proved he had been acting as a middleman. Though Sarushiro attempted to shift the blame, Edgeworth was able to prove him guilty by connecting him to a murder that he had committed. Regina, and even the circus animals, were disappointed that Sarushiro had turned out to be a manipulative individual who had never seen any of them as friends.
Since Regina was brought up at the circus, it was the only world she knew for most of her life. As such, she had a very fantastical view of the world and was extremely naive. She believed that, when people die, they become "stars in the sky". This view infuriated Acro because she didn't appreciate the gravity of losing someone to death. She also didn't understand that the Trilo Quist puppet was only that, a puppet. She thought of the dummy as a tenor who sang in the circus and that the ventriloquist himself was just someone who hung around with "Trilo".
When her father's murder case was resolved, she was reduced to tears because she finally realized all the misery she had inadvertently caused. Since Galactica's trial, she has gone around the world with the circus and has started to have a more realistic, albeit still somewhat fantastical, view of the world (such as believing that there are castles made of cake and talking rabbits in Zimbabwe). An example of her growing maturity is that she now recognizes what a ventriloquist is, as well as the need to handle various logistical issues, which she offloaded onto Sarushiro while he was employed with the circus. At this point, her ability to move on from tragedy is borne less from a belief about people becoming stars in the sky, and more from a desire to put the past behind her because the show has to go on.
Unbeknownst to her, Regina's looks often put her at an advantage. Moe describes her as being "cuter than a little puppy Maltese" and people often give in to her demands with a single cutesy look from her. Her looks have also made her the object of affection of at least three of her fellow circus performers: Max Galactica, Ben Woodman, and Bat.
Her Japanese stage name "Mirika" (ミリカ), comes from from her full name "Tachimi Rika" (立見里香).
"Regina" comes from the Latin word for "queen" or "princess". It may have been chosen due to her father doting on her or due to her tiara and scepter; possibly those accessories along with her name were meant to show her relationship with her father.
"Berry" was likely chosen for the pun-based name of her father's circus (Berry/Very Big Circus).
Her French surname was chosen for the same reason as in English; to provide the pun-based name of her father's circus. In the French version, the circus is called "Cirque Hullere" which is a play on the French word "circulaire", meaning "circular".