Pacifica Northwest is the most popular girl in Gravity Falls and the diametric opposite of Mabel Pines. Her popularity stems from her family's wealth and prestige of being the great-great-granddaughter of the supposed founder of Gravity Falls, Nathaniel Northwest.
Pacifica is first seen in "Double Dipper," when she competes with Mabel for the title of Party Queen at the Mystery Shack party. She and Mabel sing and dance, showing that Pacifica is a very good singer and dancer. However, the crowd chooses Mabel, probably because of her spirit and friendly disposition. But then Pacifica bribes Old Man McGucket with money and threatens people with an ice cold stare to get her just above Mabel Pines and win the party crown. She then leaves with a large part of the crowd to go to her after-party on her parents' boat, and the crowd carries her away on their shoulders.
In "Irrational Treasure," she makes a speech for Pioneer Day, and then insults Mabel for her silliness of wearing a sweater of a dog playing basketball. She also taunts Grunkle Stan when he's put in the stockade. She is later informed by Dipper that her great-great grandfather, supposedly the founder of Gravity Falls, was a huge fraud. Dipper also gives her the secret cover-up document as proof. This causes her great worry, as it would discredit her entire family.
During "The Time Traveler's Pig," Pacifica appears at the Mystery Fair and makes a very unkind remark about Mabel. Later, when Mabel and Dipper are traveling through time, the two accidentally create an alternate timeline where Pacifica is the winner of Mabel's prized pig, Waddles. This horrifies Mabel, who convinces Dipper to go back in time and reverse the incident. At the end of the episode, Pacifica is seen being attacked by a chicken she won, instead of Waddles.
She makes another cameo in "Boyz Crazy," entering the Gravity Falls Civic Center and Buffet with her friends to watch the Sev'ral Timez concert. She is seen buying tickets, and later watching the concert, holding up a sign that says "Sev'ral Timez."
In "Mabel's Guide to Colors," Pacifica surprisingly takes part in Mabel's survey of Gravity Falls' favorite colors. Pacifica answers with barely a hint of mockery.
In "The Golf War", Mabel embarrasses Pacifica and Pacifica challenges Mabel to a mini golf tournament. After discovering the Lilliputtians, Mabel has them sabotage Pacifica's game for her. However, one group decide to kill Pacifica instead, requiring Mabel to save her. After they get away from the Lilliputtians, Pacifica grudgingly accepts both Mabel's apology and an offer of a ride home.
It is shown in the episode that she does not live a normal life. She receives a lot of pressure from her parents to be the best at everything, does not know how to react to common behaviour (like eating in the car or sharing), and lives in a mansion with fountains and peacocks. She also does not receive much support from her parents as they often put important parties and business matters before her.
A tube titled 'Pacifica's Memories' appears among the rest in "Society of the Blind Eye" revealing that a some point in her life, the Blind Eye Society deleted her memory of something supernatural, possibly from the events of "The Golf War."
Stuck-up, sarcastic, rude, arrogant, snotty, and mean, Pacifica is a stereotypical popular blonde girl, having money, style, and talent. She is the show's diva and looks down cruelly on "weirdos" such as Mabel and her friends Candy and Grenda, and lords her ancestry over the people of Gravity Falls. Her parents spoil her and seem to encourage her cruel behavior which has greatly affected her psyche, to the point of valuing what her parents drive into her: money, winning and looks. It appears that some of her behavior stems from a need to prove herself as a Northwest to her parents, and her outward appearance is a way to cope with some of her insecurities. She seems to think that her family is better than everybody else's, and that they are perfect. When Dipper gave her undeniable proof of her family's fraudulence she did not take it very well initially, but eventually got over it because "money makes problems go away."
In spite of this she and Mabel have gained some common ground and she showed minor signs of humbling after almost being left for dead at the hands of the Lilliputtians and getting a ride home in the Pines family's car. She even compliments Soos's "W-neck" idea, and tells Mabel that she had fun playing mini golf. Pacifica has shown a certain amount of naivety in regards to common acts of kindness such as sharing, or even actions that are unfitting of the upper class such as eating in the car.
Pacifica has long blond hair and usually wears a purple jacket with a short lavender dress, along with a periwinkle belt. She also wears black leggings with cream colored boots. She wears heavy purple eyeshadow and lavender hoop earrings.
During Pioneer Day, she wore a light turquoise dress with a purple belt around it, and a yellow belt buckle in the front. She also wears black leggings underneath her cream boots and has a coonskin cap. Attached to her ears are purple arrowhead earrings and she has a skinny purple bracelet around her arm. She is still wearing the heavy purple eyeshadow.
When playing mini-golf, Pacifica wears a purple t-shirt (with her monogram written in pink on the right side of her chest), a white skirt, a white glove on her right hand, a purple wristband on her left arm, pink socks with purple diamond patterns, and white golfing shoes.
- 107. "Double Dipper"
- 108. "Irrational Treasure"
- 109. "The Time Traveler's Pig"
- 115. "The Deep End" (no lines)
- 117. "Boyz Crazy" (no lines)
- 120. "Gideon Rises" (no lines)
- 10. "Mabel's Guide to Colors"
"May the better partier win."
"Aw, 'it' thinks it's gonna win. Wait, did you hear that? People cheering for the weird girls? Yeah, me neither."
"Oh look, Mabel here found her REAL twin!"
- Her name is a pun on the "Pacific Northwest" region of America, a region containing Oregon, the state in which the show is based and where creator Alex Hirsch spent his summers.
- Pacifica's favorite color is hot pink, despite purple being her signature color.
- She has become a relatively popular character, which Alex Hirsch didn't expect because she is such a terror compared to Mabel. According to Alex Hirsch, she will also have some character development in season 2.
- She is unfamiliar with sharing.
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