She is the daughter of Dudley Puppy and Kitty Katswell, and her two brothers Pixie and Dixie. She has a crush on Crane. Her aunts are Minnie Mouse, Alice Liddell, and Wendy Darling, her uncle is Kaa, and her secret name is Cherry Blossom.
Viper doesn't wear anything but white lotus flowers on either side of her head.
When Viper goes swimming, she wears a teal strapless bikini and a matching skirt.
At bedtime, Viper wears a jungle green nightgown.
Her alternate nightwear is a yellow nightgown.
As a princess, she wears a royal dark yellow ball gown with pleats, along with a gold tiara and necklace.
Her alternate princess outfit, which is green, is similar to either Megara's dress or Princess Anna's dress.
Her Halloween costume is a Cleopatra costume.
Her alternate Halloween costume is either a Megara costume or a Princess Anna costume.
While playing in the snow, Viper wears a green scarf and a matching hat.
When Viper reunites with Crane, she wears a dark yellow glittering tank dress and two matching lotus flowers on either side of her head, but since she's a snake, she doesn't wear shoes.
Her wedding dress is either a white, sleeveless, strapless wedding dress with two matching sashes — one around her chest and another around her waist — and two magenta daisies (similar to Megara's wedding dress), a gold necklace, and a purple flower on her head, or a long, flowing, white, off-the-shoulder wedding dress with a gray neckline (similar to Anna's wedding dress, but without the sleeves) and a gold crown, along with a transparent white wedding veil, when she marries Crane.
- Viper's favorite flavor of ice cream is rainbow swirls.
- Viper played the role of Wendy Darling in Crane Pan.
- Viper played the role of Princess Aurora in Sleeping Viper.