Squid Sisters

Squid Sisters is the family ship between Callie and Marie from the Splatoon fandom.

Canon
Unlike their name, Marie and Callie are cousins. They were the first two idols of Splatoon, and appear in both the second and third game as idols no longer. The two are related to Cap'n Cuttlefish, who is supposedly their grandfather. Marie and Callie become the new agents in Splatoon 3. They are just cameo characters in Splatoon 2.

Marie and Callie have vast differences. As they are idols, they tend to disagree on plenty of things. Callie is more cheery and energetic than Marie. Marie is more of the opposite of Callie, she's more slothful, and often sarcastic. Both sisters have a different color scheme, Callie being black and pink, and in Splatoon 3, being black and green. Marie on the other hand, stays white and green throughout most of the games.

Though, with all of the things they have in common, both sisters have at least one thing in common, they are both inklings.

Octo Valley
Callie and Marie are in all three story modes. In Octo Valley, Callie, and Marie discover that The Great Zapfish, the source for Inkopolis's electricity, had been stolen. The two sisters go on to take back the stolen zapfish, alongside the main character and other side characters. The zapfish in question, had been stolen by the Octarians, who had been at war with the Inklings for several years; due to the lack of land. The Octarians had been sent underground, and needed the zapfish, to power their own electricity. The Squid Sisters, alongside others, then go on to stop the Octarian's leader, named Dj Octavio.

Octo Canyon
Story mode for Splatoon 2 shares the same story as Splatoon 1. In the game, Callie and Marie come to find out that The Great Zapfish, once again, had been stolen by Dj Octavio. The Squid Sisters go on to take back The Great Zapfish, alongside others and the main character. Soon after saving several stolen Zapfishes, it is revealed, Callie had sided with the Octarians, and was brainwashed. Marie gets Callie out of her brainwashed state, and the sisters go on to defeat Dj Octavio again.

Return Of the Mammalians
Story mode for Splatoon 3 seems to be different than the previous games. The story takes place in Splatsville, which is far from Inkopolis. With Splatsville's population increasing, Inkopolis's population decreased. Callie and Marie make an appearence in this story aswell, in Splatoon 3 story mode, the idols, such as Deep Cut, are enemies for a specific amount of time. After being defeated by the main character, Deep Cut seems to switch roles, from enemies to allies. Deep Cut teams up with The Squid Sisters, to defeat Mr. Grizz, along with other side characters.

Fanon
Splatoon seems to favor canon ships such as Squid Sisters. Though, unlike their name, Callie and Marie are not sisters, this family ship seems to be favored in the fandom. This ship seems to be one of the only family ships in the Splatoon fandom. As, not many of the inkling/octolings in the story, tend to reveal their relations to others. Some may like the family ship between Callie, Marie, and Cap'n Cuttle fish, more, as they are also family.

Fandom
FANFICTION

Trivia

 * Callie and Marie's names together make Calamari
 * If the Amiibos of the two are scanned in Animal Crossing, they will unlock Squirrel versions of themselves