Octorpedoes are missile-like Octarians that resemble Octopods and are fired as projectiles by certain bosses in Octo Valley, Octo Canyon, the Octo Expansion, and Return of the Mammalians. Unlike Octomissiles, Octorpedoes home in on their target instead of simply moving in a straight line. Once they come into contact with any surface or the player, or after flying for too long, they explode in ink. They can be splatted by being hit with ink, and take very little damage to splat.
In Octo Valley, Octorpedoes appear in Enter the Octobot King!, in which DJ Octavio fires them out of four holes on the front of his Octobot King throughout the battle. He can shoot up to four Octorpedoes at once.
In Octo Canyon, Octorpedoes appear in Sanitizarium, in which the Octo Shower occasionally fires two Octorpedoes throughout the battle. Similarly, in the Octo Expansion, Octorpedoes appear in Cool Your Jets Station and are fired by the Octo Shower Supreme in pairs throughout its boss fight, although compared to the regular Octo Shower, the Octo Shower Supreme fires Octorpedoes more often, and they are faster and have better accuracy.
An Octorpedo in the Octo Expansion.
Unofficial render of the Octorpedo's game model from Splatoon 2 on The Models Resource.
A fuzzy Octorpedo