Although she is the youngest daughter of the King and Queen Siam, Princess September proves herself the superior of her sisters as she learns the valuable life lesson about love's connection to individuality and freedom.
Here at Enotes there is a How to Do a Character Analysis (See the link below). Some points plugged into steps of this character analysis are below:
CHARACTER ANALYSIS OF PRINCESS SEPTEMBER
What are some words to describe the character?
Princess September is very emotional, greatly distraught by the death of her parrot, and extremely delighted by the charming songs of the nightingale. She wishes to share her joy by showing off her nightingale to her sisters, not suspecting that they are petty and will become "vexed" and envious by the charming bird. When her bird tells Princess September of his unhappiness in being caged, she utters a little sob. Finally, this princess is not selfish like her sisters, and, loving the little bird, she gives him freedom even though it means risking the loss of his delightful presence. It is very difficult to put the happiness of someone she loves before her own, but Princess September does this, nevertheless.
Does the character make just or unjust decisions?
At first the princess follows the advice of the petty sisters who suggest "Safety first" by caging the little nightingale so that she can enjoy his pretty songs. But, she later realizes that her decision was unjust because the nightingale is unhappy and wants to die if he cannot be free. Because she loves the little bird, she wisely risks losing him and releases him from the cage. Princess September makes a just decision because she is rewarded with the love of the nightingale who then lives.
What is the character's motivation?
Unlike her selfish sisters, Princess September loves the nightingale and delights in its affection for her as, seeing her unhappiness, it asks if she wants it to replace her parrot. It is only because the older sisters trick her by acting concerned that the bird will not be "safe," that the princess cages him. Instead, she is motivated by love to release him.
Consider the effects of the character's behavior on the other characters.
Princess September's non-conformity to the other sisters arouses their jealousy, so they wish to "cage" her like the bird by curtailing her delight. This is why they suggest that she keep the nightingale in her room so that its songs do not overshadow what the parrots can do. Their pettiness, however, does not bring them happiness as the King must marry them off to the King's Councillors along with presents.
Decide whether the character's actions are wise or unwise.
Princess September obviously acts wisely because by setting the nightingale free, she has provided it a love that is reciprocal to hers, thus enabling it to sing its lovely songs
Read between the lines....What does the author think?
Through an analysis of the character's actions and speech, the reader can determine that the author thinks that a requisite of love is the bestowing of freedom upon the beloved, not restrictions and bonds. Allowing the delight of one's love to be free will bring happiness and more love. Thus, Princess September is married to the King of Cambodia and has a cultured and new life, while the other princesses are confined to the cage of their former lives and old environment.