The Ditherer: In the second season, she decides to create a "conflict-free stage" and goes as far as to decline Cathy's offer to app for the role of Juliet to "avoid" another conflict with May. May even calls her out on it, telling her she's running away from her troubles.
Invisible to Normals: He's 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.
Fairy Companion: A Deconstructed Trope. Sora thinks she has lost her mind when she starts seeing him, his advice isn't exactly flawless, and when Sora goes into borderline Wangst status she actually stops seeing him for a while.
Armor-Piercing Slap: To Sora, when she declines Cathy's offer to app for the role of Juliet. May, already emotionally distraught for a short while, snapped so badly that she started screaming at Sora and then slapped her in ront of everyone.
Break the Haughty: And holy shit HOW! Not only she falls victim to Leon's "curse" when he deliberately injures her to knock her off her pedetal, but later she gets called out more than once on her arrogance - specially by Layla, her own idol.
Brutal Honesty: Has even less of a thoughts-to-words filter than Layla
Child Prodigy: Subverted. May was an ice skating prodigy as a little girl, as revealed by her coach Meredith, but ultimately decided to ditch skating (thought she still skates once in a while) to focus solely on the Kaleido Stage.
Break Her Heart To Save Her: In one episode, when Kalos felt as if Sarah should pursue her own dream, he tells her to leave with their old friend Andy since she's "no longer needed", leaving her in tears. His plan is ruined when Sora intervenes and forces him to confess his true feelings.
Engineered Public Confession: In order to let Sarah know how he truly feels, Sora goes to Kalos' office and teases him to reveal his true feelings. In the meantime, the others bring Sarah to the stage, and she listens to Kalos's words via Sora's hidden microphone.
I Was Quite a Looker: Invoked by Sora when she sees a photo of his younger self (alongside a teen!Sarah and their companion Andy) and can't believe the baby-faced youth in the picture is him.
Unwitting Instigator of Doom: He believes himself to be such, since he asked Aaron if he truly was up to performing the very dangerous Fantastic Maneouver... a few hours before Aaron failed to do it and died, which is the reason why Yuri is pissed off at him enough to try buying out the Stage as revenge.