Basilisk

The Basilisk is the second-in-command of Impel Down's Level 2: Beast Hell, under the Sphinx.

Appearance
The Basilisk is a gigantic chicken like creature, with its tongue sticking out in a deranged manner.

Personality
Being a giant snake born from a chicken, it shares traits of both animals.

History
When Monkey D. Luffy and Buggy infiltrated Level 2, the Basilisk attacked them, only to be defeated by Luffy's Gear Third mode.

Trivia

 * The Basilisk featured in Impel Down is based on a common mistake. Often depictions of the Basilisk show a "chicken-like" snake creature, but such a creature is actually known as a Cockatrice, as the legends are commonly mixed up.
 * Contrary to legends, this Basilisk does not have the ability to kill with its stare.