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The series is about a young girl named Sora Naegino who comes from Japan to the United States in search of her dream. She wants, with all her heart, to be a member of the acrobatic circus that performs at the famous Kaleido Stage. With the help of her friends, Sora struggles to make this dream come true.

the characters(main cast)

sora Naegino
Sora is the primary protagonist of Kaleido Star. Her parents took her to Kaleido Stage when she was young. Although they died shortly thereafter, and Sora went to live with her aunt and uncle, Sora is inspired by this childhood memory to become a member of the Stage when she reaches adulthood. With her aunt and uncle's hesitant approval she travels to the United States to audition. While Sora wanders around lost, her bag is stolen. As a consequence of chasing the thief and speaking to the police, she is late to the audition; Layla will not allow her to audition, but the owner Kalos gives her a chance to perform in the actual show. Most of the cast do not accept Sora at first because of the special circumstances through which she joins; Sora wins them over with persistence and hard work along with a magnetic personality.

In the beginning of the series Sora is the only one who can see the magical stage spirit Fool. This character reveals she has been chosen by the stage. In the first season, Fool reveals only she can perform the Legendary Great Maneuver with Layla. In the second, he reveals that she has the potential to become a "true star".

layla Hamilton
Layla is an accomplished and seasoned performer. She is a stubborn character and plays an antagonist-like role in the beginning of the story, but like many of the other characters, she finally befriends Sora after they become partners for Arabian Nights.

Layla is the daughter of Mr. Hamilton, a wealthy hotel chain owner; he would prefer Layla to be an actress and is frequently trying to push her into doing so, and he's also very work-a-holic and had little time for his daughter. Layla eventually stands up to her father and rejoins the circus; she loves the Kaleido Stage because she clearly remembers how her deceased mother enjoyed going there. At the end of the first season, after attempting the great Mystical Act and seriously injuring her shoulder Layla gives up the circus and retires to Broadway.

rosetta Passel
Rosetta is a Belgian-born, French-raised world champion diabolo performer. After her first performance at Kaleido Stage, Kalos kicks her off the stage because her act was unsatisfying: he explains that despite being perfect in the technical field, she lacked passion at what she was doing, so everyone was bored by her act. Feeling this wasn't fair, Sora takes the girl under her wing, teaching her how to put audience enjoyment before technical perfection. In return, Rosetta teaches Sora diabolo, which Sora returns to when she needs help learning new acts. Towards the end of the first season, Rosetta returns to join Sora after Kaleido Stage is taken over by Yuri. She joins Sora's troupe and witnesses Sora and Layla performing the Great Legendary Maneuver together. Rosetta returns in the second season wishing to become a trapeze artist, following in Sora's steps.

may Wong
First appearing in the second season, May is an ex ice skater and new recruit who challenges Sora's position. Sora and May have a tense rivalry for most of the second season, which aids both in becoming better performers. May turns out to be exceptionally talented and becomes Leon's partner for the Dracula show. However, during one of the performances, Leon drops her off and causes her to dislocate her shoulder; this allows Sora to obtain the spot for the Circus festival they were practicing for. May, realizing that it takes more than work and self-confidence to be a good star, refuses to give up her spot just like that and overtakes Sora with a new one armed trick, finally besting Sora and putting her on top. As she does so, May lays off her arrogance and becomes a better person.

mia Guillem
Mia is a close friend of Sora's. In the second episode, Mia accepts Sora's presence on the stage after Sora attempts to perform the Golden Phoenix. Later in the series, Mia becomes passionate about writing the scripts for Kaleido Star's performances; she has a keen interest in introduces literature into Kaleido Star's acts. She occasionally has inner conflicts between performing and tending to her sick grandmother, who is Mia's biggest fan.

anna Heart
Anna is also good friend of Sora's. She too, like Mia, comes to accept Sora after the second episode. Anna is talented in many areas and frequently plays more serious parts. Anna truly wishes to perform comedy and usually tries to get Mia to write comedy into her parts. The request is almost always denied. Anna takes her love of comedy from her estranged father Jack, a stand-up comedian; when they meet each other after several years, though, Anna is perturbed by his bitterness, but with a push from Sora and Mia they part amiably.

marion Benigni
Marion is a young girl living near the stage. Her father is a designer and works on the sets, but her mother Cynthia (a former trampoline artist) is dead due to an accident. Like many of the others, Marion does not accept Sora at first (and specially when Sora attempts to use trampolines in her acts), but is quickly won over to her side. In the second season Marion begins to perform with the group on the Children's Stage.

yuri Killian
Yuri, like Layla, is an experienced performer, yet he's deeply traumatized by a terrible tragedy. During a flashback, it is revealed that his father died attempting the Mystical Act, and he never forgave Kalos for letting his father try. Yuri plays a pivotal role in the second half of the first season when he betrays the stage, first by stealing away a good portion of the cast and later by buying out the stage and taking control of it. He later agrees to return it to Kalos if Layla and Sora accomplish the same Mystical Act that caused his father's death; when they manage to do so, he fulfills his promise. In the second season, Yuri helps Sora get into the Circus Festival in Paris. He appears to be a bitter rival of Leon's, and feels that he is responsible for the death of Leon's sister.

leon Oswald
Leon is a very famous trapeze performer who arrives in the second season. He comes off as arrogant, refusing to perform with Sora because she is not skilled enough for him. His true desire, however, lies in a promise he made to his dying sister Sophie: to see the Angel's Act, an unrivaled and beautiful trapeze act they had developed, completed. He is a rival of Yuri Killian, whom he blames for the death of Sophie in an accident.

kalos Eido(owner)
Kalos is the head manager of the entire Kaleido Stage and gives Sora many helpful pieces of advice throughout the anime. He also maintains high expectations of everyone he encounters. Before Kaleido Stage, Kalos was a stage magician and acrobat and used to perform on the street with Sarah; their past relationship is rather vague. Kalos founded Kaleido Stage with the money he got from the insurance company after he injured his fingers during an audition for a spot in Las Vegas. As a professional, he has strict standards when it comes to how things are run at the Kaleido Stage and how his performers should conduct themselves. While he's firm in his decisions, occasionally he'll give in and let people spread their wings as they please. Kalos is also the one who trained Yuri's father for the Mystical Act, but sadly this failed and Yuri's father died, traumatising Yuri and embittering him. He is the only person who can tell Layla and Sora how to train for the act.

sarah Dupont
Sarah is the diva of Kaleido Stage as well as the building manager for the dorms where everyone lives. Many want Sarah to sign on a record label because she is so gifted in singing, but she stays true to Kaleido Stage. She is an avid fan of martial arts, and frequently proposes bizarre alternative methods to help Sora achieve her objectives.

Sarah is well acquainted with Kalos and has been with the Stage from the beginning, when she and Kalos were performing on the streets with another friend. This friend, Andy, returns once to try to persuade Sarah to leave Kaleido Stage with offering her a singing career, but she refuses.

ken Robbins
Ken is the stage manager for Kaleido. He is unable to perform due to a heart condition. Ken also greatly admires Sora, in many respects, and seems to be crushed out on her, but never has the guts to confess his feelings for her. This does not stop Ken from doing everything he can to help Sora out; frequently he acts as her personal trainer, warning her of the dangers she might encounter, and acting as the voice of reason for the group on several occasions.

fool(stage spirit)
Fool is the mysterious spirit of the stage. He is about the size of an action figure, and appears as a type of jester or clown. He appears to Sora shortly before she appears on the Kaleido Stage for the first time. Fool is invisible to everyone but those who are destined to do great things on the stage and/or whose heart is completely dedicated to the stage. He seems to be the spirit of a true jester who once was devoted to a princess who never smiled.
Although a ghost, Fool is a pervert who tries many times throughout the series to see Sora, and sometimes her friends, naked (usually by suggesting that they should take a shower). Sora is quick to prevent Fool from peeking in any given situation by trapping him somewhere or rebuking him forcefully, most often in a comedic, slapstick fashion. Later in the first season, Layla becomes capable of seeing Fool as well; the same happens to Rosetta at the end of the second season.

In his more useful moments, he acts as a fortune teller, revealing possible futures to Sora (in the first season he reads the future from tarot cards, in the second season he reads and reveals the hidden workings of intercharacter relationships via astrology). He is also the one who explains the inner mechanics of the Mystical Act to Layla and Sora in episode 25, An Amazing Bond.