Gasu Gasu no Mi

The Gasu Gasu no Mi is a Logia-type Devil Fruit that allows the user to create, control, and transform into gas at will, making the user a Gas Human (ガス人間). "Gasu" (ガス) means "gas". It was consumed by Caesar Clown. In the Viz Manga, it is called the Gas-Gas Fruit.

Strengths and Weaknesses
This Devil Fruit's main strength is the ability to change into a gas-like form, allowing the user to float and go inside places that normal beings cannot, as he was seen hiding inside some flasks when he was informed that the Marines were nearby. However, he can also become dense enough to hold objects, like his cocktail glass. As explained by Brownbeard, he claimed to be the one who purified the whole island from poisonous and nerve gases. This however is revealed to be just a cover story, with the poisonous gases being used to give birth to Smiley.

The gas that Caesar produces is very poisonous. The gas appears to be explosive when set alight, which allows Caesar to create controlled explosions without harming himself. Additionally, the user has the power to manipulate other preexisting gases in a certain area.

The gas form appears to be weak against fire, although this is mitigated by the user's ability to minimize oxygen levels in the surrounding area, preventing combustion. On the other hand, it seems to take some concentration or is only possible while solid to manipulate the oxygen, as Usopp and Nami could breathe again when Brownbeard struck Caesar with a metal pipe. Other than that, the user is also affected by the standard Devil Fruit weaknesses.

Usage
Caesar Clown has mainly used his fruit as a means of hiding, slipping into flasks, and floating in the air. He has enough control over his fruit to move freely and seize solids such as a cocktail glass. Caesar seems to prefer to keep his powers active at all times, as he is seen in complete or partly gaseous form, not yet have been seen in solid form.

In battle, Caesar releases poisonous gases that seems to cause instant death to an average victim, or ignitable gases of tremendous explosive power. He can also absorb and remove the oxygen within his vicinity, removing his weakness against fire, as well as force his opponents into unconsciousness or even death via asphyxiation.

Caesar has used the following named attacks:
 * Gas Robe (ガスローブ): Caesar generates a cloud of poisonous gas and sends it towards his enemy. He claims to have conducted many experiments with the gas, to the point where he is sure that breathing it in will cause certain death. Despite this, the attack was ineffective against Luffy due to the poison immunity he acquired from Magellan.


 * Gastanet (ガスタネット): Caesar fills a pair of castanets with explosive gas and slams them together to create a massive gas explosion. Despite the scale of the attack, it does not cause any harm to Caesar himself. When fighting Luffy, he was able to increase the strength of the attack by surrounding him with smaller globs of slime and detonating them, although Luffy was able to escape unharmed. The name of the technique is a pun on the castanets (カスタネット) used to perform it.

Trivia

 * Since this fruit's power revolves around gas and poisonous substances, it is very similar to the Moku Moku no Mi and Doku Doku no Mi. However Caesar is shown to be personally offended when someone compares his Devil Fruit to the Doku Doku no Mi.

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