Princess Isabella is a princess of the Blueberry Kingdom in the comedy series The Fuccons, introduced from the twenty-sixth episode onward. She is eighteen years old and the daughter of the Blueberry King, who rules an enchanted realm described in the series as a wealthy country that exports oil and holds gold mines. In keeping with her title, she dresses in the ornate style of a storybook princess.

Her personality is defined by arrogance and snobbery. She behaves as though convinced of her own superiority, speaks with a notably coarse and blunt manner, and repeatedly uses the verbal filler "te iu ka," a phrase roughly equivalent to "I mean." Her haughty disposition and dismissive attitude toward others are the main features of her characterization.

In the story she is sent by her father to marry Mikey Fuccon. The Blueberry King, grateful to Mikey after the boy helps him, wishes to make Mikey a prince and offers James and Barbara Fuccon a large sum of money to adopt their son. Isabella appears throughout this engagement storyline, in which Mikey becomes formally betrothed to her. Her presence places her in direct contrast with Emily, Mikey's usual girlfriend, and his cousin Laura, and the engagement tests where Mikey's loyalties lie; at one point Mikey admits he would rather marry Isabella than Emily or Laura simply because she is wealthy. Beyond this, the series presents her less as a character with her own goals and more as a participant in a scheme arranged by her father. Her demeanor remains consistent through her appearances, and the series does not show her developing or changing as a person. She has no special powers or abilities; her influence in the show comes entirely from her royal rank and her kingdom's riches.