Waterwraith

The Waterwraith is a supernatural creature that has a humanoid shape and a translucent green-gray body. It is extremely dangerous, as it can instantly kill Pikmin by merely rolling over them, and can not be deterred or defeated until Purple Pikmin are used against it, as only they can stop it in its tracks and make it vulnerable to attack. Once it suffers enough damage, its rollers crumble and it runs about the area on foot, now harmless.

=In fanon games=

In Pikmin 251
In Pikmin 251, the Waterwraith is first seen in the Palace of the Wraith. Its behavior has been altered from, as the creature moves faster and has more health.

In Pikmin 3 (Flish version)
The Waterwraith appears in Pikmin 3 (Flish version), and with a new ability: it can teleport to fall directly on top of Pikmin to crush them. Black Pikmin are able to harm the Waterwraith, although the process is much slower than if Purple Pikmin are used.

In Pikmin 4 (Wii U)
In Pikmin 4 (Wii U), the Waterwraith appears in only two places: Ghost Den, and Paradise Forest during nighttime. At Paradise Forest, two normal-sized Waterwraiths appear initially and a larger one appears later on.

In Pikmin Galaxy Adventure
The Waterwraith, in Pikmin Galaxy Adventure, appears alongside the Firewraith, Electrowraith, Magnetwraith, Acidwraith, and Clambering Wraith. It is weaker than its incarnation.

In Pikmin: The After Years
In Pikmin: The After Years, the Waterwraith is much stronger and appears alongside the Firewraith, Electrowraith, and Magneticwraith, and the newly-discovered Acidwraith and Clambering Wraith.

In Pikmin: Dimensional Breach
The Waterwraith appears in Pikmin: Dimensional Breach, mostly unchanged from its incarnation, encountered in various later dungeons, alongside other wraiths appearing in Pikmin: Redemption. Waterwraiths make up the bulk of Derrick's army.

In Pikmin: Redemption
The Waterwraith appears in Pikmin: Redemption alongside the Firewraith, Electrowraith, Magneticwraith, and the Phantom, and is encountered only in the Haunted Village, Crystal Palace, Tower of Babil, and Pit of Redemption. Waterwraiths are extremely powerful and terrifying but yield great rewards upon defeat.

In Pikmin: The Winds of Light
In Pikmin: The Winds of Light, the Waterwraith appears twice, both times in the Royal Wraith's Palace; one appears in the lower-right arena on sublevel two, and two of them appear in the fifth wave of sublevel three's arena challenge. Also, in the Architect's Playground, hitting the wall on sublevel five produces the sound of three Waterwraiths, yet none will appear.