Octopi

Octopi are cephalopods with eight tentacles and big, ass-shaped heads that shoot black ink out of their butts. The singular form of octopi is octopus. By and large, octopi are relatively harmless, but every now and again you may come across a pissy, over-sized octopus who is just damned and determined to cause trouble.

On the Superman-Aquaman Hour of Adventure cartoon series from 1967, there was an octopus character named Topo, who appeared in the Aquaman animated shorts and also appeared in the Teen Titans. Topo was an ally of Aquaman and Aqualad, and often came to their aid when the need arose. When Aqualad got bounced around by a giant robot called the Monster Machine, Topo was there to catch him.

There is a rather well-known Spider-Man villain named Doctor Octopus, or "Doc Ock", who patterns himself after an octopus. In addition to his two human arms, he also has four mechanical arms attached to a harness. Yeah, I know. The math doesn't work. It still only equals six limbs. Maybe their counting his legs as well.

Appearances

 * 1) Aquaman: Menace of the Black Manta
 * 2) Teen Titans: The Monster Machine