With these fruits, the user will become a natural element completely. The users are neither human nor element when they are in their normal state. However, Logia users can turn completely into their element whenever they want to. Logia fruits are the rarest to find in the world of One Piece. Logia users can control their element if it already exists in the environment (ex: Crocodile controlled sand in the desert at his will), but cannot control their elements if the element is in another form (ex: Aokiji cannot control ice if it's in form of water). They may control the element within another form by manipulating the surrounding (ex: Aokiji freezing an ocean, Crocodile turning a field of grass into a desert).
Advantages: Logia users cannot be harmed physically (ex: Luffy's Gomu Gomu attacks had no effect on Smoker). They can also manipulate anything close to their element. For example, through Crocodile's sand powers, he could control dryness and absorb moisture. Another advantage is that Logia users have unlimited amounts of their respective elements and can utilize them from their own bodies.
Disadvantages: There are very few ways of harming logia users. Besides using the sea and seastone, the main method of causing harm to a Logia user are natural weaknesses which, when exploited, can ultimately negate the Logia power. An example of this is when Luffy was able to hit Eneru since his electricity doesn't affect Luffy's rubber body. The only other time a physical blow may hurt the user is when he or she is caught off guard. This can be seen when Luffy flew into a bar in Arabasta and hit both Smoker and Ace through a wall.
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