As with all characters in the beloved CGI cartoon, Petunia is as her name suggests, a rhubarb. (If you don't know what that is, Google-Image it). She was partially created b/c they were sorely lacking in female characters in the cast, & Larry the Cucumber needed a girlfriend
. Petunia must have been a hit w/ the kids, b/c she appeared in several Veggie cartoons.
I re-interpreted her as a "human" on the Heroine Fan-Art creator (I'm SO happy you can do characters with green skin, though I've never really heard of any Disney heroines with such a skintone).
Costume 1: Most of these costumes are set up in the order you see them, though the first dress is based on a "casual" outfit the animators made for Petunia later on in the series.
Costumes 2 & 3: The first time you actually see Petunia is in "Duke and the Great Pie War;" where she was a Princess who deliberately stayed with her Mother-in-law out of loyalty. (The story was mostly based on the book of Ruth). Petunia had a lot of problems with local prejudice because she was from the country Duke's people had fought in the war. She and Duke Duke
(Larry's character) eventually got married at the end of the story.
Costume 4: This was what Petunia wore in "Minnesota Cuke and the Search for Samson's Hairbrush." The story was a silly parody of Indiana Jones, but with a bible theme, as well as Larry the Cucumber playing the main part. Petunia Rhubarb played the "Marion" character known as Julia, who knew the right people to find the lost artifact. This story in particular made me laugh at all the Indiana Jones-like references.
Costume 5: The next outfit was when Petunia played a reporter in "Larry-boy and the Bad Apple." They did a lot of Spider-Man parodies in this story, not the least of which was making Petunia out to play the "Mary Jane/Lois Lane" part
Costume 6: The Indian character you see next is Sally. See, originally BigIdea Productions did a story called "The Ballad of Little Joe," which told a cowboy-themed version of the bible story "Joseph and his Brothers." (Larry the Cucumber starred as Little Joe, of course). Because that story was the precursor to the bible story of Moses, the studio had to do a similar-themed version of the Exodus. Hence the story of "Moe and the Big Exit." In this version, when Moe (also played by Larry) runs away and falls into a well, he meets Sally, a Native American woman who has a buffalo for a pet. (She's basically the cowboy & Indian version of Tzipporah).
Costume 7: The pink dress is worn when Petunia Rhubarb plays Sweetpea Beauty. One of the most recent Veggie-Tales stories was made specifically for girls. It's called "Sweetpea: A Girl After God's Own Heart." It was a mix of Sleeping Beauty and Snow White, and the theme was about finding true beauty.
Costume 8: This was from an episode I never saw, called "The League of Incredible Vegetables." I'm guessing it was a parody of "The Avengers," because it was about Larry-Boy teaming up with other Veggie super-heroes to fight a very dangerous foe, and Petunia got to be a heroine called "Vogue." I had to use a picture of her from the internet to interpret the costume.