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
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 her (implying that she may of been one too).Lolph's great, great, great, great, great, grandmother from the past. Mabel tricks Lolph into that she was her while Dipper steals his time tape.
.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 the 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 some time 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, however their arms have physically been seen and a picture of them is featured in "Tourist Trapped."
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.  It can be speculated that in the episode where Dipper clones himself, the Asian guy going nuts with punching can be Mr. Chiu, because he's Asian, and intense, because there is NO escape from music camp. 
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
- Duchess Wibblebip
- Mr. and Mrs. Drole
- Argyle Snif??r-foot
- Unnamed woman
- 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 "Shermy" Pines is the 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. 
Mr. Ramirez is Soos Ramirez's father, Abuelita's son-in-law, and Reggie's uncle. 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.
Abuelito is Soos Ramirez and Reggie's late 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 a Latina heritage.
Nate's girlfriend is mentioned by Robbie that Nate and her were going up to the lookout point but never showed. In "Double Dipper." Nate was seen dancing with a girl, that might've been her.
Steven is one of Old Man McGucket's friends. He might me Steve but a nickname. He has a wife and children and he hasn't seen McGucket in a long while.
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 decide to "liberate" his home realm.
Is 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.
An unnamed Li'l Gideon fan is mentioned by the child psychic on his date with Mabel Pines. He apparently shooed her away, telling her to "autograph her own headshot."
Wax John Wilkes Booth is one of several wax figures from the episode "Headhunters." He is a wax figure of the infamous actor and assassin of President Abraham Lincoln. When Wax Abraham Lincoln is found melted, Stan accuses Wax John Wilkes Booth of having done it.
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 letting the sunlight in and Stan then turns towards Wax John Wilkes Booth, thinking he was culprit behind it and holds him responsible.