Paramecia

Paramecia is the name given to a type of Devil Fruit. These fruits give the eaters a "super-human" power, usually it affects the eater's body in some way.

Strengths
Grants the user an ability that can be classified only as 'Superhuman'. The Paramecia fruits also contain the greatest variation of powers evident as they seem to offer the widest range of possibilities when it comes to how to exploit the ability granted to the user. Some people may encounter inspiration for a new attack after using a particular moveset for years while others will never learn how to completely use their skill.

Weakness
The Paramecia type is the only group containing powers or special traits that are considered 'useless' to the user, granting little or no real advantage whatsoever. Paramecia types are also the easiest to fight against because while the strengths of their powers give them an advantage, they also make them easy to predict and often their abilities are displayed to their fullest within a very short period of time (as noted by Enel). Although other Devil Fruit types may also leave the user as a "freak", none are more noted for this habit then the Paramecia group, whose powers are often far too freakish for normal people to accept.

Other information
Paramecia are the most common of the Devil Fruits types. Paramecia fruits can be divided into several subcategories, as it is impossible to generalize the powers. For instance, Gomu Gomu no Mi and Yomi Yomi no Mi have powers that are active at all times. Others like Noro Noro no Mi and Hana Hana no Mi have powers that need self activation in order for them to use their abilities. They however all seem to come in two basic types. Whatever powers a paramecia fruit gives, it is based on the concept of either a characteristic like slipperiness or slowness, or an object like a bomb or a door. Paramecia types are also distinguishable in the manner in which their powers manifest, either by being altering their bodies current state (Luffy and Bon Kurei), or directly affecting their immediate environments (Eustass Kid and Blueno); though some users affect both (Bonney and Foxy).

List of Known Paramecia Fruits

 * Gomu Gomu no Mi (English versions: Gum-Gum Fruit): Gives the user a rubbery body.
 * Bara Bara no Mi (English versions: Chop-Chop Fruit): Allows the user to split up body parts, as well as immunity to blades.
 * Sube Sube no Mi (English versions: Slip-Slip Fruit/Smooth-Smooth Fruit): Makes user slippery, as well as slim down and changes complection.
 * Kilo Kilo no Mi (English versions: Kilo-Kilo Fruit): Allows the user to change body weight.
 * Bomu Bomu no Mi (English versions: Bomb-Bomb Fruit/Boom-Boom Fruit): Allows the user to make body parts explode.
 * Hana Hana no Mi (English versions: Hana-Hana Fruit/Flower-Flower Fruit): Allows the user to create extra limbs on surfaces.
 * Doru Doru no Mi (English versions: Wax-Wax Fruit): Allows the user to create and manipulate wax.
 * Baku Baku no Mi (English versions: Munch Munch Fruit): Allows the user to eat anything and merge with it.
 * Mane Mane no Mi (English versions: Clone-Clone Fruit): Allows the user to physically transform into another sentinent being.
 * Toge Toge no Mi (English versions: Spike-Spike Fruit): Allows the user to create spikes from body.
 * Supa Supa no Mi (English versions: Dice-Dice Fruit): Allows the user to form blades on body.
 * Ori Ori no Mi (English versions: Cage-Cage Fruit): Allows the user to place shackles on opponents.
 * Bane Bane no Mi (English versions: Spring-Spring Fruit): Allows the user to turn limbs into springs.
 * Noro Noro no Mi: Allows the user to slow things down.
 * Doa Doa no Mi: Allows the user to create passageways anywhere.
 * Awa Awa no Mi: Allows the user to create and control soap bubbles.
 * Beri Beri no Mi: Allows the user to split body into orbs.
 * Sabi Sabi no Mi: Allows the user to rust metal.
 * Shari Shari no Mi: Allows the user to turn limbs into wheels.
 * Yomi Yomi no Mi: Grants the user to a second life.
 * Kage Kage no Mi: Allows the user to manifest and control shadows.
 * Horo Horo no Mi: Allows the user to control ghosts.
 * Suke Suke no Mi: Allows the user to turn invisible.
 * Nikyu Nikyu no Mi: Allows the user to push anything they touch.
 * Mero Mero no Mi: Allows the user to turn someone's emotions against them.
 * Doku Doku no Mi: Allows user to manipulate poison.
 * Horu Horu no Mi: Allows user to manipulate hormones.
 * Choki Choki no Mi: Allows user to transform parts of body into powerful scissors.

Filler

 * Goe Goe no Mi: Allows the user to create sound beams by shouting. (Movie 1)
 * Kama Kama no Mi: Gives user claws that can create blades of air. (Warship Island arc)
 * Hiso Hiso no Mi: Allows user to talk to animals. (Warship Island arc)
 * Kachi Kachi no Mi: Allows the user to turn hard as rock and raise body temperature. (Movie 2)
 * Samu Samu no Mi (English versions: Chilly-Chilly Fruit): The user only tells bad jokes. (SBS)
 * Gero Gero no Mi: Makes the user disgusting (SBS)
 * Nemu Nemu no Mi: Allows the user to induce sleepiness. (Ocean's Dream Arc)
 * Atsu Atsu no Mi: Allows the user to manipulate heat. (Ice Hunter Arc)
 * Mini Mini no Mi: Allows the user to change body size. (One Piece: Round the Land)
 * Noko Noko no Mi: Allows user to create and control poisonous mushroom spores. (Movie 9)

Unknown
Due to the vast amount of different Devil Fruits in the Paramecia class it is typical that not all of these powers, their extents and names are revealed during their first appearances. These possible powers (some not confirmed as Devil Fruits) are listed below:
 * Donquixote Doflamingo: Can manipulate others like puppets through moving fingers.
 * Eustass Kid (confirmed as a Devil Fruit): Can manipulate magnetic powers.
 * Trafalgar Law (confirmed as a Devil Fruit): Can create a special space, with anything inside be separated and rejoined at will.
 * Jewelry Bonney (confirmed as a Devil Fruit): Can manipulate age of anyone.
 * Capone Bege (confirmed as a Devil Fruit): Becomes a human fortress, which allows subordinates and weapons to be stored inside body.
 * Basil Hawkins (confirmed as a Devil Fruit): Can control magical straws, voodoo abilities and transforming into a scarecrow like creature.
 * Urouge: Can increase muscle mass (Life Return or something similar also possible).
 * Scratchmen Apoo (confirmed as a Devil Fruit): Can morph limbs into instruments and use sound or music as weapons.
 * An unknown user from Impel Down: Grants tunneling ability.
 * Lafitte: Can transform arms into wings granting the ability to fly.