She is a sperm whale, which means her mother was most likely a whale as well. She is revealed to be sixteen years old in the episode "Whale of a Birthday."
She is shown to be an extremely spoiled, entitled, selfish, and insolent (even more so than Mr. Krabs) teenage girl, often demanding things from her father and throwing tantrums whenever they are not met.
Pearl wears a short pink cheerleader dress, with the letter P stitched into it, which stands for Pearl. She also sports short, white, heeled boots. Pearl has smooth gray skin and is huge. When she cries, she floods the area. Pearl has a red heart lipstick on her nose, which turns into lips when she kisses, and she has blonde hair pulled into a ponytail with a pink clip. She has blue eyes and six eyelashes on each eye.
Mr. Krabs is Pearl's father, and as such, Mr. Krabs is in nearly every episode that features her. She is often very disrespectful towards him, using him as a source of money. Despite realizing this, Mr. Krabs never tells her off, even allowing her to force him to meet her demands.
Despite their troubled relationship and conflicting traits, they love each other very much and share a close bond.
Although Pearl has been seen with her father many times throughout the series, she has not yet been seen on-screen with her grandmother, Betsy Krabs.
In the past, Pearl has appeared to like SpongeBob. In "The Chaperone," she takes him to the prom and ends up enjoying her time, despite the trouble SpongeBob causes. In "The Slumber Party," Pearl acts annoyed towards SpongeBob, due to his attempts to infiltrate her sleepover. In "Barnacle Face," she thanks SpongeBob for allowing her to go to the school dance when he puts diamonds on her face. In some episodes, they display a love-hate relationship.
Sandy and Pearl have not had much interaction, but they have encountered one another. In "Bubble Troubles," Pearl helps Sandy by giving her air. They seem to share a mutual friendship, as Pearl believes that mammals need to stick together. In "Texas," Pearl is one of the townspeople who want Sandy to stay in Bikini Bottom. She and the rest cheer for Sandy deciding to stay. She also attends Sandy's birthday party in "Feral Friends."
Squidward and Pearl have an awkward relationship. In "The Chaperone," Pearl refuses to go out with him to her prom. In "Welcome to the Bikini Bottom Triangle," Squidward calls her a "drama queen." Pearl thinks that Squidward is such a "barnacle." She likes teasing him, as seen in "Drive Thru." In "Whale Watching," it's revealed that Squidward used to babysit Pearl when she was a kid.
Friends in Bikini Bottom High
Pearl and her friends were best friends. In "The Chaperone," they do not laugh at Pearl that SpongeBob is her prom date, then in "Tunnel of Glove," they tease and humiliate her that SpongeBob is her "boyfriend," and then tell the whole TV broadcast that Pearl and SpongeBob are dating. In "Drive Thru," Pearl has new friends.
"Oh, actually it was really funny when that hot dog landed in Judy's hair!" —"The Chaperone"
Pearl has not been seen interacting with any other relatives besides her father.
While her birthday is unknown, a few facts about her birthday are known. 1. The earliest that Pearl could be born is 1995 or January 1996. 2. Pearl was born several years before January 28, 2016.
^Assuming that Mr. Krabs did not know Squidward prior to him hiring Squidward to be The Krusty Krab's cashier, in Whale Watching, Squidward is revealed to have babysat Pearl when she was a baby, which means that she could have only been born at most three years (Pearl is still wearing a diaper in the photos) before Squidward joined the Krusty Krew, which was in 1998 or January 1999.