She is a light yellow female sponge who looks exacty like SpongeBob. Except she wears a lavender and pink dress, uses bright red lipstick, has brown hair, and has a pink bow on her hair.
She also wears magenta colored shoes. In the episode, she is seen carrying a light green sleeping bag.
She appears to have a valley girl-like voice.
Judging by her introduction of herself, her personality appears to resemble that of a stereotypical teenage girl.
Role in episode
Pearl and her friends all think she is SpongeBob in disguise, so they throw tomatoes at her. She looks and sounds a lot like SpongeBob, but it is shown that she is not him because as she is running away, the real SpongeBob and Mr. Krabs immediately drive up and have no idea who she is. Her part ends when she screams, "I am so moving back to Farawayville!"
At that point, Mr. Krabs asks, "Who was that?," whereupon SpongeBob ironically replies by saying, "I don't know...but she is ugly!"
"Hi, I'm here for the slumber party."
"My name is, um... Girly Teengirl!"
"Um, I just moved here from... um... Farawayville."
"I don't know what you're talking about!"
"I am so moving back to Farawayville!"
In the Dutch version, she is called "Spongy Betty."
Instead of "I'm so moving back to Farawayville!," she says, "Ik voel me zo niet gewild!" ("I feel so not wanted!") in this version.