Despite her limited screen time, she is one of the most likable characters in the Disney Princess franchise.
Mary Costa does a wonderful breath-taking job voicing her.
She has the ability to talk to her animal friends, which is seen when she was talking to them about her dream prince.
As gullible as she is at times, she isn't completely dumb, as she clearly knew that Flora, Fauna, and Merryweather were up to something when they were planing a birthday surprise. She just didn't know what they were up to.
She thankfully became more fleshed out in Maleficent II: Mistress of Evil.
She has a wonderful and beautiful character design.
She is such an amazing singer, as she sang two songs "I Wonder" and most famously "Once Upon A Dream."
Her reunion with her parents King Stefan and Queen Leah is heartwarming, despite being rushed.
She can be somewhat gullible at times, as proven when she gets brainwashed by Maleficent.
Although she's the main protagonist of the film, and while she's quite likable, she, just like Queen Leah, hardly gets a lot of screen time to develop her role as a character, making her kinda feel like a weak protagonist. This is mostly because the film is focusing more on the Good Fairies and to some extent, Maleficent and Prince Phillip.
If the scene with King Stefan and King Hubert were to be set in the beginning, this could have possibly have the opportunity to let her have some extended screen time as a character and might have possibly invited Phillip sooner, which could have been more fair with her.