Curse Escape Clause: Her curse can only be broken by a vow of everlasting love, which if made to another person will kill her.
Damsel in Distress: She gets captured by an antagonist in each of the three movies. Notably, however, while she does require saving, she had previously done everything she could to try and liberate herself or at least get Derek's attention to help free her. While she does need Derek to save her in the first film, it's somewhat justified since Rothbart's spell can only be broken either by him or be Derek making a vow of everlasting love to the whole world, so Derek is an integral part in breaking the spell. Odette even basically says if she could break the spell by herself, she would.
Disney Death: Twice. The first time she is killed by Rothbart's curse and the second time by Zelda's destroying Seeker.
Dogged Nice Girl: As a child, she constantly tried to get Derek to play with or spend time with her and often chased him and Bromley. Unfortunately for Odette, Derek seemed to view her as his Abhorrent Admirer. note Given his later line that he thought she "started out as such an ugly duckling."
Derek: We've tried all summer, but we just can't lose her!
Ironic Echo: "So happy to be here..." She says this in a resigned voice right after she first meets Derek, clearly not meaning it. During her Love Epiphany, she says it again with sincerity.
Light is Good: You mean to tell me the princess dressed in white turning into a white swan in golden "light water" and with golden hair is the heroine? Color me shocked! Used as a subtle plot-point: it's implied to be how Derek noticed the red and black costumed Bridgette is not Odette.
Improbable Aiming Skills: Can snipe at two birds at a great distance, fire multiple arrows simultaneously, and slice an apple clean in two with one arrow.
Oblivious to Love: While the case could be made that Odette had feelings for Derek before they were adults, due to her constant attempts to spend time with him, Derek is 100% blind as a bat to his own feelings for his entire life, up until meeting Odette again in the ballroom. He even comments, "'Til now, I never knew..." during his Love Epiphany.
One True Love: Is this for Odette. Their duet is called "Far Longer Than Forever" for a reason.
My God, What Have I Done?: When he sees Odette dying from his Mistaken Declaration of Love to Bridget. Also, while neither he nor Odette said anything about it, Derek's expression indicates he was thinking this when he realized that the swan he was trying to shoot a few moments ago was actually Odette.
Why Don't You Just Shoot Him?: As noted above in Pragmatic Villainy, Rothbart was trying to take over William's kingdom by getting Odette to marry him and thereby legally make him king. Odette noted that he had enough power to take it over if he wanted, but Rothbart had already tried that before William banished him.