Ken is the first face Sora meets when she comes to Kaleido Stage after her missed audition. Unlike Layla, Ken is more kinder to Sora and they easily become friends. Ken also acts as Sora's manager when she needs help training. She is oblivious to the fact that Ken has a crush on her, often stating that they're just friends or saying something that completely embarrasses him.
Anna and Mia
Anna and Mia are the first friends Sora made when she came to Kaleido Stage when she joined. At first, they both hated Sora for the same reason as the other performers did. Anna had a feeling Sora had got in good with the "boss", which was Kalos, and they even teased Sora when they saw her cleaning the stage alone and how she had trouble in practice. But after seeing the burning determination in Sora to pass Layla's challenge of performing her Golden Phoenix, Anna and Mia are first to suggest that Sora quit. But Sora doesn't quit because she wants to prove to everyone that she can stay. From that point on, Anna and Mia are Sora's closest friends and the three are almost never seen without the other by their side. Their friendship helped give birth to their three man performance during Cinderella when all three were Fairy Godmothers. Whenever Sora starts to doubt herself or feel lost, Anna and Mia are always the first to respond and they do their best to cheer her up.
At first, Layla and Sora's relationship starts off on a rocky start due to Layla's immediate despise of Sora for expecting to audition when she was late. Her hate against Sora keeps up until she sees Sora performing the lead in The Little Mermaid, a performance that she was once the lead role in. What really surprised Layla was seeing how Sora's suggestions changed the show and made the cast seem more into their characters. When Arabian Nights was in production, Layla automatically rejects the thought of performing with Sora as her partner. But she admits that there is something about Sora that she can't ignore, so she holds an audition to see if the two can perform together. Both pass, including Sora's amazing move of grinding a trapeze rope using a diabolo, and Layla soon begins opening up more to Sora. When they are living together to get into sync, the two of them become closer even more and by the time their first show ends, a friendship has started between them. When Yuri takes Kaleido Stage, Layla openly admits that the only person she feels she can be her true partner is Sora. Soon after Layla can see Fool, their ability to perform together is pushed to it's limit when they attempt The Legendary Great Maneuver and gain control of Kaleido Stage from Yuri and back to Kalos. During training, Layla injures her shoulder severely and this ends their partnership, in which Sora bursts into tears. But before the episode ends, Layla asking Sora to become her dream: a true Kaleido Star, which is Sora's drive in the second season. When the two meet again at Broadway, Sora automatically starts to cry and hugs her former partner. Even with a few difficult moments facing Sora up to the end of the series, Layla remains Sora's friend.
Just like with Layla, Rosetta seemed kind of cold to Sora. This is first seen when she doesn't shake Sora's hand during their first meeting and how she insults Sora for the fact that she got her birth place wrong. When Kalos decides to terminate Rosetta's contract after her first show, Sora is the first to try and get Rosetta another chance. Kalos agrees under the catch that she has to train her. Rosetta automatically believes Kalos is a fool when she learns the news, as Sora doesn't have any diabolo experience. Rosetta even decides to give up early. But her look on Sora changes when Marion and Ken bring her to one of Sora's live shows and asks her to see Sora during Cinderella. Rosetta is just awe struck that Sora can make everyone watching her performances applaud, even if she makes a mistake. She then tells Sora that she would still like to perform with Sora and their diabolo battle is a hit. Rosetta feels so alive again that she thanks Sora for everything before leaving again. When they meet again for their show at Marine Park, Rosetta's personality has completely changed and she is a close friend to Sora. When Rosetta returns in New Wings and fully joins the main cast, Rosetta idolizes Sora and they have a sister like bond. She is also probably the biggest supporter Sora has and even offered to share her room with her when her contract was terminated. Rosetta is also learning about trapeze performing with Sora and is the third lucky girl from the cast to see Fool. In Sora's eyes, Rosetta may very well be the one to surpass Sora one day since her vision of the older Rosetta in The Princess Who Never Smiles OVA.
Officially the first person to despise Sora for "causing Layla's incident" last season, May declares herself Sora's rival and the two are always vying for the chance to perform with Leon and to outshine the other. And when the Circus Festival came, May had won and Sora left Kaleido Stage heartbroken. But with Sora gone, May was lost. She couldn't feel the flame she had when she competed with Sora and as thus has lost the ability to please the audience. But when Sora returns, May realizes that Leon's true partner is Sora and she ultimately admits defeat before becoming a friendlier person to Sora. During special training with Layla, May discovered what Sora had that she lacked. And that was the ability to smile herself. She then learns to get her own smile back as well as supporting Sora when she was casted as the lead for Swan Lake and not freaking out when she was casting as a lower importance character. May even prepared a large breakfast for her. Since then, May's sarcasm is still in her but she's more of a good friend to Sora and the others.