Octopus

Octopus is the Quirk used by the villain Innsmouth.

Description
Their Quirk provides Innsmouth with the physiology and skills of an octopus, such as multiple elastic appendages, suckers and the ability to spit ink from its siphon-like mouth.

Trivia

 * The Quirk is similar in nature to Octoid's Cephalopod, although the two characters don’t seem to share any apparent relation.