Here's a little something I've wanted to do for a while! This was made mostly out of curiosity, as a way to speculate on what colour genetics could've influenced the look of characters we've heard of but were never shown (Elli's dad, Bet and Stratos's sister, why Spheria is not yellow like Sunny, etc)
Some of these look pretty empty, so I will revisit this in the future to add more members to each family tree. These trees are also sprinkled with some oc's and my own headcanons.
Here are a few notes/reasonings/headcanons I have for each family:
Spheros:
My headcanon for the Spheros siblings' father is that his name is Exo Spheros, and his colours were quite dark. Both Exo and Rotunda came from families that were very mixed, and as a result, their children came in a variety of colours. Exo's side tends to have darker colours, while Rotunda's side has lighter colours.
Exo has bright red eyes, while Rotunda has green eyes. The clash of these colours caused a range of muted browns and reds in their children's eyes.
Rotunda's hair was white in the show, most likely from old age, therefore I made it so that her natural hair colour is the same as her daughter's hair colour, in order for it to make a bit more sense as to how her granddaughter (Elliptica) ended up with pink hair.
Partial Albinism is a dormant and recessive gene that runs in Rotunda's side of the family. It's a mutation where only the skin of the individual is affected: their skin lacks pigment and turns out white, while their hair and eye colour retain pigment and inherit a mix of their parents' colours. This mutation has been dormant throughout Rotunda's family line, until it showed its face in Betrayus' colours. Since Rotunda's side of the family has lighter colours, the overall lack of pigmentation has a link with this gene.
My headcanon name for Stratos and Betrayus' sister is Radia Spheros. Along with Betrayus, she has very little resemblance to either parent, precisely because of their mixed heritage. There is a little bit of dark red on Exo's side of the family, and this combined with Rotunda's lighter colours made Radia come out as a muted pink. Radia is the oldest, followed by Stratos and then Betrayus.
Unironically, all the Spheros' siblings have hair that is styled in a similar way to their father's.
Headcanon name for Elli's father is Ellipton (Ellip for short). Unlike Radia's side of the family, Ellip's family had a long line of consistent purples and blues, so these genes are stronger. Therefore, Elli looks a lot more like her father than her mother, and this is also why Elli was named after him.
Pac:
Headcanon that the reason why Spheria is not yellow like Sunny is because Spheria and Sunny are only half-sisters.
Sunny's father had an affair with a red woman before he married Sunny's mother, thus Spheria was born a little bit before Sunny. The affair was a point of conflict between Sunny's parents for a while, but eventually things settled down when Sunny was born.
Unfortunately, at some point Spheria's mother passed away and she was placed in her father's care, effectively making Spheria part of Sunny's side of the family. This is also why Spheria still has an accent; she grew up in a different state far away before she moved in with her father and his family.
Despite not having the same mother, Sunny and Spheria still grew up together and came to see each other as full sisters instead of half.
Zac's side of the family are pure yellows, while Sunny's side of the family have a tiny bit of mixing in their earlier ancestry, but the yellow genes are still strong enough for Sunny to have all of the powers and qualities that comes with being a Yellow One.
Cylindria:
The pink highlights in Cyli's hair are 100% natural and not dyed. This is thanks to a common gene that runs in her family, in which streaks of colours are present in their hair. It mostly comes from Starchild's side of the family, as seen in Granny's case. Elliptica has this gene too, inherited from her father's side of the family.
We never saw Moondog's real eye colours because he wears shades/custom glasses, so I gave him light purple eyes.
Moondog's side of the family is also a little bit more mixed, compared to Starchild's family who has been more consistently pink. Therefore Cyli inherited her black hair from her father and her pink skin, eyes, and hair streak gene from her mother.
Headcanon that Granny's real name is Windsong, and "Granny" is just a nickname that she's more fond of.
Additional headcanon that Granny became the first person in the family to think that their naming traditions have gotten a little silly, and so she strongly advocated for giving her granddaughter a "normal" name as opposed to a hippie name, which is how they ended up with Cylindria (her parents wanted to name her Moonchild instead. Cyli was eternally grateful that Granny stepped in to suggest a different name lol).
Spiral:
We literally know nothing about what Spiral's family looks like, other than a vague hint in one of the Chrsitmas episodes. So for now both his parents are red.
Though I am playing with the idea of giving Spiral a step-father, so that might be added in the future.
General Pacworlder colour genetics:
The more a certain colour is present in a family line, the stronger that colour gene is. For example, if the father's line is pure red, and he has offspring with a blue mother with a mixed lineage, then their children have a 75% higher chance of being red rather than blue or mixed.
Overall, mixed families usually produce offspring with stronger genes because of their diverse genetics. The only downside to this is that their mono-colour genes are weakened. The more a particular colour is present in a family-line, the more likely that offspring may get weaker genes in other areas outside of colour because of the lack of diverse breeding. This is seen in old medieval times when royal families married their cousins in order to keep the bloodline "pure" but it resulted in poor health among the descendants. Aside from this example, it is still entirely possible to have a healthy, pure colour bloodline without inbreeding, because Pacworlders with all kinds of colours are broadly populated across the planet.
More to be added in the future :)
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