Tiana is a young waitress from New Orleans who has held a passion for the culinary arts ever since she was a child. Inspired by her late father, Tiana steadily works day and night shifts at two different diners in order to raise money to buy an old sugar mill, which she plans to turn into the restaurant ("Down in New Orleans"). Charlotte La Bouff, a débutante and childhood friend of Tiana, hires her to provide beignets for the Mardi Gras masquerade ball being thrown by her rich father, Eli "Big Daddy" La Bouff. Eli, the perennial King of the Mardi Gras, seeks to welcome the recently-arrived Prince Naveen of Maldonia as an eligible suitor to his pampered daughter. Tiana is thrilled to finally have enough to purchase and renovate the old sugar mill into her restaurant ("Almost There").
The disinherited Prince Naveen, penniless and unskilled, is nevertheless intent on marrying a wealthy woman rather than learning a trade. He and his valet Lawrence encounter Dr. Facilier, a voodoo witch doctor who convinces the pair that he can improve both their lives. Instead, after reading their fortunes, Facilier transforms Naveen into a frog and gives Lawrence a voodoo charm, filled with Naveen's blood, which when worn transforms his appearance to that of Naveen's. Facilier intends for Lawrence, under the guise of Naveen, to marry Charlotte in order to gain access to her father’s fortune ("Friends on the Other Side").
At the ball, Charlotte unknowingly flirts with Lawrence as Tiana discovers she may lose the mill to a higher bidder. Tiana then meets Naveen, who, believing her to be a princess because of her costume, asks her to kiss him and break Facilier's curse. Tiana reluctantly agrees, in exchange for the money needed to outbid the other buyer. However, instead of Naveen turning back into a human, Tiana is turned into a frog herself. A chase ensues, and Naveen and Tiana escape to a bayou.
Lawrence (still disguised as Naveen) later proposes to Charlotte, who happily agrees, but soon the magic in Facilier's charm wears off and Lawrence reverts to his original form. Facilier tells Lawrence they need another sample of the prince's blood in order to prolong the spell, but discovers that Lawrence had foolishly released him. Facilier turns to the voodoo spirits for help, with the promise that once Lawrence marries Charlotte, he will have total control over New Orleans and will be able to offer the citizens' souls as payment. The voodoo spirits give Facilier shadow demons, who are then dispatched to locate Naveen.
At the bayou, Tiana and Naveen meet Louis, a trumpet-playing alligator, who offers to lead them to Mama Odie, an ancient and good-hearted voodoo priestess who they believe can undo the curse ("When We're Human"). Later, they meet Ray, a Cajun firefly, who joins them on their journey ("Gonna Take You There"). Ray tells Tiana about his love, Evangeline, who is later revealed to be the Evening Star ("Ma Belle Evangeline").
When the four at last meet Mama Odie, she tells the frogs that Naveen must kiss a true princess for them to become human, and that since Eli La Bouff is King of Mardi Gras, Charlotte is a princess, but only until the stroke of midnight, when Mardi Gras is over ("Dig a Little Deeper"). Naveen soon realizes that he loves Tiana, but before he can admit his feelings, he is captured by the shadow demons and brought to Facilier.
Before Lawrence (disguised as Naveen) and Charlotte can marry, Ray helps Naveen escape and steals the charm. Ray gives the charm to Tiana in order to hold back Facilier's minions, but is killed by Facilier. Facilier then confronts Tiana and transforms her back to her human form. He then offers to make her restaurant dream come true in exchange for the charm, but she refuses upon realizing that true love is more important and attempts to destroy the talisman. However, Facilier's shadow grabs hold of its shadow and hands it back to Facilier himself. Tiana is changed back to a frog and Facilier mockingly declares that she is fated to remain that way forever. Tiana quickly uses her frog tongue to grab hold of the talisman and smashes it upon the ground. The angered voodoo spirits come forth and claim Facilier himself as payment for his debts and drag him into the underworld forever.
Tiana and Naveen reveal their love to each other and explain the situation to Charlotte, who agrees to kiss Naveen so he and Tiana can be together. The clock strikes midnight before she can kiss him, but the two decide they are content to live together as frogs. At the end of a funeral for Ray, he appears as a new bright star next to Evangeline.
Later, Tiana and Naveen are married by Mama Odie. Because of Tiana's new status as princess, they are restored back to human form after their kiss. They then have a real wedding within the St. Louis Cathedral. The couple return to New Orleans to celebrate and, with Louis' help, convince the Fenner brothers accept the payment money and hand over the key rights. Together, Tiana and Naveen work on transforming the sugar mill into the long awaited restaurant. In the final scene, the restaurant - which is called Tiana's Palace - is thriving, with Louis and his band playing to a joyfully full house, while in the sky smaller stars encircle the larger stars of Ray and Evangeline ("Down in New Orleans (Finale)").
Analysis:
Romanticism Theory talks about the free expression of the feelings of the character. The artist's feeling is his law. In this film, Tiana and Naveen though thrown with trials and circumstances still believed that true love is more important than anything else. Together they faced it and fought it because of their love for each other.
As you could see at the falling action, even though they still have the chance to be back as humans, they still chose and agreed to stay the way they are or as frogs because they know that they would still be together whatever their features or characteristics may be.
