Unlike their regular counterparts, Octodivers are equipped with snorkel masks and hide in pockets of Octarian ink. When the player approaches them, they quickly surface from the ink and begin firing. They are able to dive into their own ink when under attack or too far away from their target as a means of defense. Octodivers can have two tentacles, making them a Twintacle Octodiver, or just one, in which case they are normal Octodivers.
In Splatoon 2, after diving into their own ink, ink patterns can be seen as where they last submerged.
Octodivers' most distinguishable feature is probably their mask resembling the Snorkel Mask. Octodivers have light green eyes rimmed with purple, and their pupils are gray-blue.
Octodivers, like Octotroopers, have one or two red tentacles with multiple suction cups and a light cream underside to match that of their bodies. They rest upon blue-rimmed kettle-like machines in Splatoon, and light blue plastic machines with black rims in Splatoon 2.
An Octodiver sitting in ink
A Twintacle Octodiver in Inkvisible Avenues
A Twintacle Octodiver in Flooder Junkyard
Characters in Splatoon
Characters in Splatoon 2