This a list of unseen characters who exist within Gravity Falls, but have not properly appeared in the series.
Auldman "Old Man" Northwest was the father of Preston Northwest, grandson of Nathaniel Northwest, and the grandfather of Pacifica Northwest. He was the patriarch to the late 20th century. During his investigation of the Northwests' fraudulence, Ford Pines attempted an interview with Auldman, but was forcefully removed from the family's grounds before he could get the chance.
Boy in blue's mother
The Gnome Queen was the original queen of the Gnomes. She was, however, eaten by a badger.
Cat lady's son
Cathy Grenshaw was a girl who attended one of Stanford's schools when Stanford was younger. She is only mentioned in Journal 3 with the section mentioning her having a red line crossed through it.
Deputy Durland's grandmother
Sandy Trembley was the third wife of Quentin Trembley back in the 17th century. She is mentioned when he and the Pines Twins try to get out of the wooden box while hearing a woodpecker, Quentin thinks it sounds like her (implying that she may have been one too).
.GIFfany's creators were the various programmers of the game Romance Academy 7. When programming the game the character .GIFfany eventually gained sentience. The programmers unsuccessfully attempted to delete her, and in response, she "deleted" them.
Grenda's mother mentioned when her daughter first meets Mabel. Grenda called her mother about having a sleepover with her new friend. In "Carpet Diem," Grenda brings one of her mother's "age-inappropriate" romance novels to a sleepover.
Jeffrey Cannuck is a victim of the Blind Eye Society's memory erasing. Based on where his memories are stored, it can be inferred that he knew notable information about Gravity Falls' supernatural side.
Mr. Northwest was a robber who lived sometime between the 19th and 20th centuries. He is an ancestor of the modern Northwest family.
- Main article: Dipper and Mabel's parents
Mr. and Mrs. Pines are the parents of Dipper and Mabel Pines, who reside in Piedmont, California. While they are mostly just frequently mentioned only, their arms have physically been seen and a picture of them is featured in "Tourist Trapped."
Mr. and Mrs. Chiu
Mr. and Mrs. Chiu are Candy Chiu's parents. At one point, Candy spoke to her mother about having a sleepover with Mabel. Later, it's revealed that every last week of summer vacation, Mr. and Mrs. Chiu force their daughter to attend music camp. 
In "Gravity Falls: Lost Legends," a member of the Blind Eye Society is seen with a tube of "repressed memories" marked "Mrs. Corduroy memories." Shmebulock speculated on his fan chart that she may be in another dimension.
Northwest Fest guests
The Northwest Fest guests include several powerful individuals who attend the Northwest family's annual party.
Among who are pictured but do not physically appear include:
- Baron Sneer-Snout
- Mr. and Mrs. Drole
- Argyle Snif??r-foot
- Unnamed woman
Lunch Lady Phyllis, likely named Phyllis, was mentioned by Gideon Gleeful in one of his letters to the Pines' family, and Mabel Pines in particular. In the letter, Gideon implied that he was attracted to Phyllis, a lunch lady at the Gravity Falls Maximum Security Prison.
- Main article: Queen of the Manatees
The Queen of the Manatees is Mermando's fiancée, whom he pledged to marry to avoid an undersea civil war. She is not mentioned until the last known letter of Mermando is delivered to Mabel Pines, and the engagement likely took place after he met Mabel.
Sherman "Shermie" Pines is the younger brother of Stan and Ford Pines and the paternal grandfather of Dipper and Mabel Pines. He is mentioned in "A Tale of Two Stans," and is mentioned again in Gravity Falls: Journal 3. He was also on Shmebulock's Pines conspiracy board in Gravity Falls: Lost Legends. Stan also mentions him in Gravity Falls: Legend of the Gnome Gemulets, where he reveals that he wore a bow tie to the hospital when the twins were born. It's unknown if he is still alive or what his current whereabouts are.
Abuelito is Soos Ramirez and Reggie's late maternal grandfather and Abuelita's former husband. According to her, he is "not [in heaven]."
Mrs. Ramirez is Soos' mother, Abuelita's daughter, Reggie's aunt (and therefore the sister of one of his parents), and Mr. Ramirez's wife. Little is known about her, aside from the fact that she is of Latin American heritage.
Nate's girlfriend is mentioned in "Boyz Crazy" by Robbie when he says that she and Nate were going up to Lookout Point, though they never showed up. In "Double Dipper," Nate was seen dancing with a girl that might've been her.
Sky Tram Host
A Sky Tram Host provides information about the "world's slowest sky tram."
Soos Ramirez's unnamed father, Abuelita's son-in-law and Reggie's uncle, is never actually seen in the show. Soos has not seen his father since he was at least four years old. Soos realized the extent of his father's neglect on his twelfth birthday, which led to a decade-long disdain for the date. In "Weirdmageddon 2: Escape From Reality," since he's never seen his dad, Soos fantasizes that he has the body of a pro wrestler and a face he once saw on a hot sauce bottle.
- According to Alex Hirsch, Soos' father is Caucasian while his mother is Hispanic.
- Soos' Spanish-language surname, Ramirez, suggests that he took his mother's surname.
Susie was, at one point, suspected for the murder of Wax Stan.
Bill's parents are the deceased mother and father of Bill Cipher, who were destroyed in the 2nd Dimension by their own son when he decided to "liberate" his home realm.
Baron von Fundshauser
The father of Marius von Fundshauser. He died when Marius was only seven years old, during the time his son inherited a cravat and an epaulet factory that quickly gained prominence among the richest of the rich in his entire home area.
Uncle Phil was, at one point, suspected for the murder of Wax Stan.
Unnamed Li'l Gideon fan
Wax Abraham Lincoln
Wax Abraham Lincoln was one of several wax figures from the episode "Headhunters." He was a wax figure of the American President during the civil war, who had melted due to the fact that someone left open the window, thereby letting the sunlight in. Stan Pines then turns towards Wax John Wilkes Booth, thinking he was the culprit behind it, and holds him responsible.
Wax John Wilkes Booth
Held responsible as the killer of Wax Abraham Lincoln by Stan Pines.