NEW YORK – Olivia, the little girl pig with the big imagination, is stepping out of her picture book world into a bold, new and much more colorful life on Nickelodeon.

The twirly drama queen and fashionista seems more mature at the ripe old age of 6 3/4 in the eye-popping animated series that preserves her can-do spirit and love of red stripes while broadening her social life.

Gone is a bit of Olivia’s squirm in Ian Falconer’s award-winning, mega-selling books. The large-headed piglet still wants what she wants – and wants it yesterday – but there’s a touch more patience as she navigates the day-to-day with friends and family.

The babyish voice of Olivia – with just a hint of whine – is pitch-perfect thanks to 12-year-old Emily Gray, a sixth-grade newcomer from San Diego, Calif. Emily vaguely remembers reading the books in her preschool days but said she grew fond of the popular porcine after voicing 26 half-hour episodes for the weekday show that premiered Monday.

“I like how outgoing she is and how she tries new things and doesn’t worry about what everyone else thinks about her and just wants to be happy with herself,” Emily said.

Falconer, who based the character on a real Olivia – his niece – worked closely with creators of the series, said Megan Laughton, the supervising producer in New York for a London-based brand management firm, Chorion.

The production company Brown Bag Films in Ireland was chosen to expand Olivia’s basic look beyond red, white and black but preserve her spunk and physical humor. Animated Olivia remains as she looks in the books – with red jumper or red sweater with her signature stripes – but she’s set against a subdued color palette that grows richer when she’s daydreaming – something she still loves to do.

“Really more than anything, it was how to best showcase our little girl and these characters, and to pop them off the background and not have it be distracting,” Laughton said.

He considers Olivia’s essence both on screen and off “just this little girl who has this huge imagination and turns the everyday goings-on of life into this incredibly big adventure. But it’s not for accolades. It’s not for stardom. It’s just how she is.”

Brown Johnson, president of Nickelodeon’s animation unit, said the series is different from the heavy educational hand of “Blue’s Clues,” ”Dora the Explorer” and other popular Nick shows. Olivia, she said, is “really about storytelling” without being too “storybooky.”

The show’s creators wanted the TV characters to look like the characters from the books. But Nick lost the white background of the books to avoid the show looking “like she lived in a gulag,” Johnson said.

There were lengthy discussions about Olivia’s voice, she said. The creators decided to use a girl rather than a grown-up to help keep the character funny and opinionated with a child’s capacity to imagine in sequences that briefly land her in Egypt, the Wild West and outer space.

Falconer, 49, wrote and drew the books with an illustrator’s eye that he has also lent to 30 covers of The New Yorker magazine. He has designed costumes and sets for the New York City Ballet, San Francisco Opera and the Royal Opera House in London, but Olivia made him a star.

His first Olivia book was an instant hit in 2000, selling 1 million copies its first year and earning a Randolph Caldecott honor in 2001 for best illustrated children’s book. Five books followed, generating 6 million more in worldwide sales, accompanied by spinoffs and lots of merchandise. The books are now published in 40 countries and translated into 20 languages.

In 2006, Olivia even got her own U.S. postage stamp in a series honoring favorite children’s book animals.

Olivia is a girly-girl in Falconer’s books. On TV, she acquires some boys as friends and classmates, including the sweatsuit-wearing Julian, a pig with a darker skin tone.

“Diversity in general is really important to us,” Johnson said. “Pigs do come in lots of colors.”

While the books might appeal more to girls, Laughton said kids of both genders have responded positively to the series.

“You never really know until you put it in front of the intended audience,” she said. “They’ve been really engaged with it and really, really connected to Olivia.”