I've thought of a Splatoon 3 story that deviates from the usual "You become an agent, go underground and battle the Octarians". This could be a long one. Also, I'm very well aware that Splatoon 3 won't come in a long time. Without further ado, here's my take on it.
It has been 8 years since Splatoon 2, a new music duo has appeared, they are themed around rock music. The usual news happens in the beginning except that now, green oily substance has mysteriously appeared in various parts of Inkopolis, with the peace between Inklings and Octarians, they now must work together to defeat this new threat. You are enlisted as Agent 5, an Inkling or Octoling who noticed the oily substance on your way to another populated part of Inkopolis. You later find out that the Salmonids started an invasion. Lucky for you, the Octarians of Inkopolis set up various defenses so that Salmonids can't take over certain parts. For now, the hub has various walls up, but they will eventually come down as you clear Inkopolis from Salmonid activity. As you explore Inkopolis, you'll start seeing Salmonid robots who look humanoid. As to put it simply, they are called Salmonlings due to the fact that they were built to have the same abilities as Inklings and Octolings. Salmonlings would be found in multiplayer-based stages where you have a match of Splat Zones to turn off the Salmonlings of that area. You eventually find out who or what was behind this invasion. The remaining A.I. left over from its defeat 8 years ago, it started using the liquid that fell into the water to take control of Salmonids. After the final battle, the A.I. malfunctions and self-destructs, ending its torment on the sea creatures. In post-battle sequence, you learn the reason why the invasion happened, some Grizzco locations were forcefully closed due to moral implications, thus they couldn't send crews to prevent Salmonid overpopulation. The A.I. knew that it couldn't control the Octarians anymore, so it chose the Salmonids with its high population status.
It has been 8 years since Splatoon 2, a new music duo has appeared, they are themed around rock music. The usual news happens in the beginning except that now, green oily substance has mysteriously appeared in various parts of Inkopolis, with the peace between Inklings and Octarians, they now must work together to defeat this new threat. You are enlisted as Agent 5, an Inkling or Octoling who noticed the oily substance on your way to another populated part of Inkopolis. You later find out that the Salmonids started an invasion. Lucky for you, the Octarians of Inkopolis set up various defenses so that Salmonids can't take over certain parts. For now, the hub has various walls up, but they will eventually come down as you clear Inkopolis from Salmonid activity. As you explore Inkopolis, you'll start seeing Salmonid robots who look humanoid. As to put it simply, they are called Salmonlings due to the fact that they were built to have the same abilities as Inklings and Octolings. Salmonlings would be found in multiplayer-based stages where you have a match of Splat Zones to turn off the Salmonlings of that area. You eventually find out who or what was behind this invasion. The remaining A.I. left over from its defeat 8 years ago, it started using the liquid that fell into the water to take control of Salmonids. After the final battle, the A.I. malfunctions and self-destructs, ending its torment on the sea creatures. In post-battle sequence, you learn the reason why the invasion happened, some Grizzco locations were forcefully closed due to moral implications, thus they couldn't send crews to prevent Salmonid overpopulation. The A.I. knew that it couldn't control the Octarians anymore, so it chose the Salmonids with its high population status.
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