With the context of the Book of Bill and the characterisation of Bill, I ended up finding that all the members of the Zodiac have a thing or two in common with Bill Cipher.
Six fingered hand-Stanford Pines
-Both have a genetic mutation which they got ostracized for but made them interested in the worlds beyond.
- Both are egocentric and smart.
-Both have a thirst for revenge to prove the people around them they were wrong about them.
-Both didn't mean to endanger their dimension (Ford wanted knowledge and Bill wanted to show them the stars)
-Animals aren't safe around them (Ford set a bird on fire by mistaking it as a Phoenix and Bill ripped out a deer's teeth in his debut and in the storyboards of Weirdmageddon P1 he uses a deer to forcibly kiss Ford's statue as if they were his Barbie and Ken)
-Both have a weird sense of humor
-Both are considered criminals in the multiverse (Theft in Ford's case and Manslaughther, Murder alongside other stuff like mass property destruction in Bill's case)
-Both project onto others they see as similar to themselves (Bill with Ford-and on a minor scale Pacifica-and Ford with Dipper)
-Both ended up getting tricked by a conman (Ford by Bill and Bill by Stanley)
-Both are authors! (The Journals and the Book Of Bill, which are essentially diaries that talked about what their lives were, a bit about themselves and the creatures they found through their life)
Crescent symbol/Fish-Stanley Pines
-Both are scammers
-Both share mannerisms, one of them being referring to Ford as Sixer(which led to people theorizing Stan was Bill's reincarnation)
-Bad relationship with their parents but seem closer with their mom (Bill's parents tried to make him blind to the 3rd dimension but it seems Bill genuinely loved his mama Scalene while Fildbrick didn't value Stan as much as Ford and Caryn was the only one worried about Stanley and was one of the 2 persons that assisted his fake funeral)
-Both were seen as a bad kid growing up (Bill by the people on his dimension due to his mutation and the habilities this granted him while Stan was seen as lesser than Ford due to the latter's gigantic IQ and his rebellious nature)
-Both made one mistake that heavily affected the course of their lives and can never return home because of it (Stan ruining Ford´s project and Bill setting his home ablaze)
-Both didn't mean to push Ford away from them nor put their families in any danger initially(Bill wanted Ford to continue with the portal and got sad after their fallout and Stan did what he did in a moment where he wasnt thinking rationally and it cost him 30 years of loneliness and guilt)
-Both went to jail on different occassions (Stan on Colombia and Bill after going on a rampage in the bar while drunk after the fallout with Ford and the Theraprism if you wanna add it)
-Both tend show only 1 eye to people as well as a cane (Bill only has 1-although he can shapeshift and have multiples as seen in his demon form- and he uses the cane mostly in Dreamscappers, a bit in Sock Opera and in the intro for Weirdmageddon while Stan uses a patch and an 8 ball cane for tourists during his mystery man persona)
-Both used their art to influence people (Stan with the Mystery Shack's attractions and Bill using animation and figurines which failed, unlike Stan's works, unless you count the Lil' Stanley comic)
-Both have used a red demon costume once (Bill in the book and Stan in a picture in Gideon Rises)
-Both wanted to set the journals on fire (with Bill actually doing it in Weirdmageddon Part 1)
-They find Dipper's disstress/fear and annoyance hilarious (Stan teasing him vs Bill terrorizing him)
Glasses-Fiddleford McGucket
-Both end up going insane after a traumatic event (The destruction of his home dimension in Bill's case and McGucket taking a peek into Bill eating his own exoskeleton after crossing the portal)
-The times they helped/aided people it ended bad for them (In McGucket's case, Dipper with his new voice and the Gideon Bot that ended up getting destroyed in the scuffle with Dipper and in Bill's case; Dipper became Bill's puppet and Gideon didn't get the Shack's signature hence he had to use dynamite as a plan B and Weirdmaggedon only lasted 4-5 days for the Henchmaniacs while in McGuckets case's Shacktron didn't survive against Bill as they didn't consider protecting the arms and legs the same way that the Shack was protected)
-Both played a part in the creation of secret societies (Fiddleford by creating The Societyvof the Blind Eye and Bill by the Ciphertologists and inderectly creating the Anti-Bill Cipher society by terrorizing 4 persons)
-Underneath all that insanity and very deep in that broken mind, there is one very smart broken guy.
-Both lost their families (At least Fiddleford could reconciliate with some of it but Bill doesn´t have the same chance anymore)
Bag of ice-Wendy Courdory
-Both are rebellious and dislike authority figures.
-They like to do what they want with no regard for rules
-Both abused their power on more than one occasion (Wendy by stealing snacks and throwing water balloons at the elderly when working at the pool and Bill throughout his deals and in Weirdmageddon)
-They've had guts to face powerfull creatures (Bill the Time Baby and Wendy stuff like the ShapeShifter, the Unicorns or the Eye Bats in Weirdmageddon)
-Both lost a mom when they were young.
Questioning Mark-Soos Ramírez
-Both are smarter than what they look like upon first sight.
-Both lack a dad (Bill's died while Soos's left him)
-They have a funny side to them (Bill more leaning to sadism though)
-Both had their eyes damaged by Mabel (Soos by getting attacked with glitter in Stan Is Not What He Seems and Bill by getting sprayed with graffiti paint in Weirdmageddon Part 3)
Stiched heart-Robbie Valentino
-Both had their relationships ruined by their own arrogance, negligence and dishonesty (Bill being an abusive partner while Robbie was immature).
-They did not take the fallout with their partner well (at least Robbie would never dare to do anything similar to what Bill did)
-They tried to pursue their partner after the break up but to no avail (Bill with threaths and later on with offers of power and Robbie by using music as seen in Gideon Rises and both actually using messanges-Bill wasting Ford's Post-it notes and Robbie sad emails and texts to Wendy)
-Both are good with music (Bill can play the piano and xylophone as seen in his apology video and Robbie can play the guitar and both can sing)
-Both insulted Soos or referred to him in condescending ways (Robbie called him Big Dude and Bill adressed him as "the fat one")
-Both had beef with a 12 year old and wanted to harm them (Robbie wanted to fist fight a child aka Dipper and Bill planned to commit suicide in Dipper's body, turn the mystery twins into corpses, disassamble their molecules and almost kills Mabel in the series finale)
'Both got turned to stone at one point in Weirdmageddon (Robbie when it started and Bill at the end of it)
One eyed Pentagram-Gideon Gleeful
-Having too much power that they acquired at a young age which heavily affected them and began their rise to villainy
-Both have a hatred towards Stanley Pines for meddling with their plans to obtain absolute power and ultimatetly ruining their plans which ended with them in prison.
-Both burnt a picture of the object of their affections; destroying the section with the rest of their family and leaving their faces untouched.
-Both planned to use Mabel and Dipper to get one of the original mystery twins to give them what they wanted
-Both left the Pines Twin they were interested on imprisoned during Weirdmageddon.
-Both deep down craved adoration and attention.
-Both lead a gang of criminals but dont treat them with a much respect as the one Pines Twin they are pining on while hating the other twins for thinking they turned them away from them when in reality it was their actions that did.
-Both got punched in the face by a Pines Twin in a season Finale inside someone´s head (Gideon Bot's and Stanley's)
-Both seem to care about their appearance (Gideon worrying about his hair the most and Bill about his bowtie, given the scream he lets out when Dipper blasts him and him readjusting it a couple of times during Weirdmageddon)
-Both ended up in prison after acquiring a position of absolute power where they do art therapy
-Both are snappy dressers and use their charm to trick people
Llama-Pacifica Northwest
-Both had messy childhoods that turned them into who they are now.
-Both are pretty good liars and can trick people very easily (Bill with his deals and Pacifica in the Lost Legends comic)
-Both look down on people they see as inferior to them(Bill with humans and Pacifica with the working class, hillbillies and the Pines before the events of The mystery of the Northwest mansion and Weirdmageddon)
-Both see themselves as monsters that cause havoc no matter where they go or what they do (Pacifica in dreams and Bill due to what he did in his home)
-Both were forced by their parents to act in a certain way (Bill´s at least loved him and were good intentioned)
-Both are fighters (Pacifica by defying her parents wishes, facing against the ghost and the face stealer in Lost Legends and refusing Bill's deal in her dream and Bill could stand a fight with Shacktron which he ended up defeating and in his book its implied he can fight easily against demons or ghosts)
-Both have wore a crown (Pacifica in her debut episode and Bill in his portrait in the Penthouse suite of the Fearamid)
Shooting Star-Mabel Pines
-Both are agents of Chaos (Mabel being Chaotic Good/Neutral and Bill Chaotic Evil).
-Both enjoy partying and to have fun.
-Both have a wild imagination and a sense of style.
-Both like karaoke and have had a karaoke night with one of the original mystery twins
-Both have eaten stuff normal people shouldn't eat/gross things(Bill his exoskeleton and illegal punch and Mabel getting wasted with Smile Dip, a leaf, huge amounts of sugar that would end with her sick, Mabel juice and she once got hospitalized by eating sniff and scratch stickers)
-Both like makeovers (as seen in a part of the book of Bill where he talks about hiding the blood of his past)
-Both think highly of themselves (Bill's bottomless ego vs Mabel being secure about her talents, qualities and appearance)
-Both have social skills that made others attracted to them, mostly loners or freaks (Bill with his Henchmaniacs for their shared love of chaos and Ford with his smarts and cosmical knowledge and Mabel with Candy and Greta by being weirdos and not being as popular as Pacifica and her posse)
-Both adress Ford as "Fordsy"
-Both have rolled in the grass in Gravity Falls(Bill while possesing Ford during puppet hour and Mabel in Tourist Trapped)
-Both put their wants over other people's and/or their needs (Like in Sock Opera but even if Mabel is sometimes selfish at least apologizes and learns from her mistakes while Bill doesn't care who he hurts and would never apologize)
-Both use white out to exclude certain stuff they dont like from reading material to "fix it" or crayons/markers to cross them (Mabel with the dialog in the Comix Up story in Lost Legends or certain things such as her summer romances and in the Mabel´s guide to color with the picture and Bill with a section where part of The Great Gatsby is shown on his book where he mentions assigned reading or stuff like his exes and his former friend The Oracle/Seven eyes)
-Both became gods of destruction, first time by accident and the second with full intention(Mabel by accident with the rift and ending with MabelLand and Bill with the accidental destruction of his home and with Weirdmageddon)
-You could argue they're awfull when it comes to romance (Mabel's attempts always end in failure and Bill fumbled Ford so so hard)
Pine Tree-Dipper Mason Pines
-Both are good at decoding codes and solving mysteries and have good academic skills.
-Both didn't have many friends growing up and were picked on as kids (Bill for his mutation and Dipper for his birthmark)
-The times they wanted to prove themselves to others ended badly for them (Dipper caused a zombie apocalypse and Bill destroyed his dimension by accident)
-The names they use aren't their real names (Bill confirmed in an AMA years ago that Bill Cipher is just a name he picked so humans could converse with him without going bonkers upon first contact and Dipper's name is actually Mason but everyone refers to him as Dipper due to his birthmark)
-Has cloned himself (Bill's are a natural hability for him while Dipper made copies of himself via paper-rest in piece Tyrone)
-Both were adorable as babies.
-Both got obsessed with someone to the point of messing with their personal lifes (Dipper with Wendy during her relationship with Robbie and Bill with Ford and his relationship with McGucket)
-They changed hats at different points in their life; Dipper in Tourist Trapped changes from his green hat with a five point star to the classic blue pine tree while Bill sported a multicolor hat as a kid before changing into a tophat (if we take the theory that Bill's hat was originally his father's then both Dipper's and Bill's were owned by a family member before being passed on to them, Dipper's belonging to Stan)
I know this is probably just a coincidence (save the stuff with Ford as some were meant to highlight the bond these two had and establish parallels between the two, making them doomed soulmates and adding another layer of sadness over the toxic yaoi) but a fun one still.
Thanks for reading!
