Midler

Midler is a famous Stand user (as Avdol knew about her) hired by Dio to kill the Joestar group, infiltrating her Stand on Mohammed Avdol's submarine to trap them in a closed space. Taking the form of different things, her Stand continuously attacks and escapes from the group, while Midler taunts them talking through her Stand. Eventually trapping them in her own Stand's mouth, Midler claims that her teeth are harder than diamonds and tries to crush Jotaro with them, but instead has her teeth punched out by Star Platinum. Jean Pierre Polnareff, wanting to take a look at her, goes to her convulsing body but says it isn't worth to look, because of her now toothless face.

(Source: Jojo's Bizarre Encyclopedia)