Siren is a female ghost which is covered by clothes-like energy. It creates vertically stacked copies of itself to misguide its enemies. All three bodies, the real one and the two fakes, will damage you. It changes colors as you damage it. To damage the ghost, you have to hit the correct body. Hitting a copy results in a 'twang ' sound, but you'll hear a more solid noise when you hit the correct body. The correct body changes each time she pauses to fire.
First form: Purple hair, pink skin and green robes. Second form: Lighter Blue hair, pink skin and yellow robes. Final form: Darker blue hair, lavender skin, and brown robes.
Like all sub-bosses Siren can be captured in a trap.