She is voiced by Britt McKillip, who also voiced Hannah Marie in Scary Godmother: Halloween Spooktacular, Baby Lola in Baby Looney Tunes, Sabrina Spellman in Sabrina's Secret Life, Peppermint Girl in Barbie in the Nutcracker, Princess Melody in Barbie as Rapunzel, Princess Rita in Barbie as The Island Princess, and Princess Cadance in My Little Pony: Friendship Is Magic.
Upon an emission with that recollecting, Janessa along with her 11 sisters are often takes those of time to straining by hard works then preserved their father, Randolph in seems to be had fitting with royalty to resolved their assets with duties. While Isabella died was more years, Janessa and her sisters are waited to coming into dining room to salutes their father. Genevieve, who is last one to be arrival on them side, took eats to the foods. Prime by enough in while, Janessa, Genevieve, and other princesses are every leaving out the palace, they are greeted with Derek and his green parrot pet, Felix.
She only keeps looking with her eyes as saw Lacey used the key to opening the carriage that viewing a few ballet shoes. Putting on the shoes when they received them in over intently, she started dancing together with her sisters, and Derek only played the flute for them. At the night, Janessa and all of princesses are lived in the round bedroom. She wanna to collecting her insects, tightest on deems that Ashlyn, Blair, and Courtney are being afraid of spiders, scorpions, and snakes. Rowena crops up into the kingdom while gets out from the navy blue carriage with her servant, Desmond.
However, Janessa mets them as well as her be respectful for her sisters. By the morning, Janessa, Kathleen, and Lacey then joins with their birthdays, Genevieve and another princesses are singing the song and having gives thus facts in blooming on crimson blossom to them in all place with their gifts. After presenting to their late mother's story, Janessa and her sisters are later crossing to the magical world, who are wills step over to dancing, Lacey hurts with her knee that she must going to cured by Genevieve. Back to their home, Janessa and her sisters are time to sleeping but wakes up by Rowena.
Rowena's major aims is poisoning in died to her cousin and rule the kingdom as the queen, Janessa and her sisters are agrees this matters to stop her. Randolph is clearly known that he was sick will, she, Genevieve, and other princesses are take care for their father and sing the courtesy song to him. While gets on the new shoes, Janessa and her sisters are sends to the magical world again, retook with dance by popular stage. Enforced by Rowena to cleans up, Janessa and her sisters are hates that the pains to lugs. Reaves the heirlooms from the kingdom, Rowena actually to pledging with apothecary.
Passing to the magical world by thrice, Janessa and her sisters also takes parts the danced with the golden princes, Derek, and Genevieve's kitty pet, Twyla. Rowena is now making as the ruler of the kingdom with recruited many guards to served her. Janessa, Genevieve, Derek, and other princesses are teleporting back to the castle together but its seeks to takes down Rowena and her minions. Randolph is gets into a danger, Janessa and her sisters tries to saves their father be right with there. Lacey hold on the magic water from the magical realm with her hands to enters the palace and treats him.
Janessa was going to says Lacey no due to worrit that her being caught by Desmond, Genevieve and Derek are seak into the kingdom to against the tyrannical Rowena and the armor knights. Randolph was falling into sleep but not yet awaken, Lacey has taken away to her father's bedroom with Desmond. Genevieve used her fan to defeated Rowena and make her father wake up. Since Rowena and Desmond were failed and banished from the kingdom, Janessa and her sisters are celebrating Derek and Genevieve's wedding to dancing in the garden of the kingdom along with their father.
Janessa acts like the leader of the triplets, because she is the eldest triplet. She is very close with Kathleen, and wants to protect Lacey. She looks the most obedient from all twelve princesses. She is very sweet, faithful, and gentle. She loves collecting insects and is fond of them.
Janessa has dark brown hair and dark blue eyes. Her princess and ballet dresses are aquamarine blue. When she wears her ballet dress and the Rowena's gray dress, she wears her hair in a bun; in other cases her hair is untied. She also resembles her mother like her elder sister Ashlyn.
The top part of Janessa's day dress is pale blue and the sleeves are short and puffy. There is a band around her waist with a flower on it, and her skirt is blue and white. She wears white tights and light blue dancing shoes so she can dance with her sisters. Janessa wears the same nightdress as all of her sisters. It is long and white with long sleeves and it is floaty. Rowena makes Janessa and her sisters wear a gray dress. She also has to wear her hair in a bun with a gray band. As all the sisters look the same, their individuality is taken away from them.
Janessa's ballet dress is like her day dress, but shorter. She wears her hair in a bun with a purple band with this dress. When Janessa was the bridesmaid for Genevieve and Derek's wedding, her dress is similar to her day dress but the colors are different. She has her hair out and the dress is white at the top. The skirt is very pale yellow and her dance shoes are white.
- Janessa's favorite gem is the aquamarine.
- Janessa's favorite flower is the jonquil.
- She shares her name with Janessa from Barbie Presents Thumbelina.
- She has a caterpillar named Harold.
- She is the first princess shown in the movie.