HEADCANNON BOARD

Oh, and, look at the numbers. Add in the corresponding number in so we can count how many head cannons we have here! 

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Headcannon #1

Inklings are born with a specific color. This color will be fixed for life, unless... special cases.

These colors will be reflected by the color of their tentacle tips. Callie, Marie and a few others are exceptions, where this law is the opposite: their tentacles are their birth color while their tips reflect their current ink color.

After a battle, the colors of their tentacles and gear will change color. But, the colors will return to the Inkling's birth color overnight. Basically, they can't get another color. 

Here are the exceptions.

If an Inkling joined a competitive quad, they'll have to go through a squad spawner which'll change them into the squad's ink color. That color will become their permanent ink color and that'll be the color they're in the next day they woke up. However, their tentacle tips will remain the same color. If either the inkling is kicked out of the squad for whatever reason or the squad either unregistered, they are allowed to either keep their current permanent ink color or go through the squad spawner in order to restore their colors.

Some inklings are unable to change back to their birth/squad colors overnight. This is a minor defect that no one bothers.

Splatfest Tees will also help keeping an Inkling's ink color during a Splatfest.

As an Inkling ages, their colors will started to fade and eventually turned into white by the time they could no longer produce enough ink to fight.

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Such rules can be applied to Octolings too. However, An Octoling's tentacles will remain red (or black for elites) instead of dark magenta overnight.

Head cannon #3

An Octozooka (Inkzooka :3) is an exclusive weapon to Octarians. Octozookas are main weapons and functions a bit different from Inkzookas.

A Slosher is an exclusive weapon to Inkling though, so there is a balance after all.

However, a roller-like weapon known as the Stomper was recently made for 'Stamp Octolings. It does not function like a roller, as you can't roll it around, but it can slam down on an enemy, making it a one-hit KO. It slams down as fast as a Carbon Roller can but the coverage is wider than that of a Dynamo Roller.

Octarians also have an exclusive ability: "Fly". They're reserved for 'Copter, 'Bomber and 'Striker Octolings. This ability allows them to hover above the ground, hence will not take stepping in enemy ink damage, however this greatly reduces their movement speed. Inklings have two abilities Octarians don't have: Open Gambit and Last-Ditch Effort.

That makes head cannon 4, 5, 6, 7, 8 and 9. Thanks Chrom!

Headcanon #10

Despite not giving any abilities, gloves are part of the fashion to Octolings.

Headcannon #12

Inklings and Octarians can heal by regenerating with the help of ink. However, scars can be formed if the wound is infected before they let them heal. The infection is not necessary to make one ill, it just means the wound cannot heal properly and thus leave a scar.

Some Inklings/Octarians are born with a minor defect where all wounds will leave scars.

And the opposite happens too: some Inklings/Octarians are born with a slight mutation where they can heal all wounds  without leaving a scar.

Bonus with the previous head cannon: Due to Humans digging up fossils of Dinosaurs, and some are still kept well under the soil, beings in the Mollusc Era mistakenly believed that Dinosaurs lived with humans and humans somehow tamed these gigantic beings.

Headcannon #15

Horseshoe crabs like Sheldon has 4 visible limbs and the rest are hidden under the shell. 

Headcannon #17

DARK THEME WARNING

Octolings are defeated Inklings, whose souls are recycled and repurposed as part of the Octarian army.

(I do not use this head cannon but it's out there and it's awesome)