Shiku Shiku no Mi

The Shiku Shiku no Mi is a Paramecia-type Devil Fruit that allows the user to afflict others with diseases. It was eaten by Doc Q.

Etymology

 * "Shiku" is derived from shikku (シック), the Japanese way of pronouncing the English word "sick".

Strengths and Weaknesses
The Shiku Shiku no Mi allows the user to create diseases that can hinder an opponent. The diseases can take many forms, such as one that turns males into females. They can also be contagious, allowing them to spread among a group of enemies.

Intense Haki use can allow an opponent to resist and break through the Devil Fruit-afflicted illnesses, which will also result in antibodies that will cure others affected by the illness. Apart from this, the user is also susceptible to the standard Devil Fruit weaknesses.

Usage
Doc Q has used this ability to briefly infect the Heart Pirates with the Feminization Disease (女になる病).

History
Doc Q gained his ability at some point likely as a result of the Blackbeard Pirates' Devil Fruit hunting.

Trivia

 * Doc Q's Feminization Disease is similar to the Emporio Onna Hormone technique used by Ivankov with the power of the Horu Horu no Mi as both change the target's gender.
 * The Shiku Shiku no Mi can be considered the opposite of the Chiyu Chiyu no Mi, as the Shiku Shiku no Mi infects the user's targets with diseases while the Chiyu Chiyu no Mi user heals their targets.
 * Doc Q's use of the Shiku Shiku no Mi combined with being a horseman that uses a scythe is a reference to Pestilence, one of the Four Horsemen of the Apocalypse.