Dero Dero no Mi

Reducing objects to liquid is the gift of this Paramecia, which lies outside the main canon and made its debut in the third chapter of the spin-off novel Law. English releases title it the Melt-Melt Fruit, and whoever consumes it is dubbed a Dissolving Human, since the power liquefies both outside matter and the eater's own frame. The name plays on the Japanese term derodero, which paints someone so worn out they can scarcely keep their feet. Its lone recorded eater is the villain Artur Bacca.

Most commonly, the wielder melts into a fluid state, which sends ordinary strikes passing harmlessly through them. In that liquid form the user regulates their own acidity, gradually eating away at whatever brushes against them. A darker application aims at the heart: by meeting a victim's gaze, the user corrodes that heart in both a figurative and literal way and takes command of the person. Should the effect run past a full day without being cancelled, the victim dies. Because the trick depends on direct eye contact, anything blocking the line of sight, reflective lenses included, defeats it. The liquid body shrugs off physical force entirely, yet electricity still runs through it and reaches the user, and beyond that only the usual Devil Fruit weaknesses are known. Bacca channels the power through three named moves. His Derorinpa, or Dissolving Wave, sends a shaft of light out of his eyes; anyone struck in the eyes has their heart melted and falls under his will. Trocadero liquefies his body for defense. Melty Love spits a stream of acidic fluid from his mouth that scorches through whatever it lands on, the corrosion weakening the more often it is fired.

The power rests with Artur Bacca, an enemy Trafalgar Law faces over the course of the novel. Bacca relies on it in two ways, offensively to force enemies and even ordinary civilians under his sway, and defensively to dodge blows by melting into liquid.