Supa Supa no Mi

The Supa Supa no Mi is a Paramecia-type Devil Fruit that enables the user to gain the characteristics of a steel blade, even allowing the ability to mimic blades on their body, thus becoming a Fullbody Bladed Human (全身刃物人間, Zenshin Hamono Ningen). "Supa supa" is the noise a knife makes when cutting through something. It was eaten by Achilles.

Strengths & Weaknesses
The main strength of the Supa Supa no Mi is the characteristics its user gains. For example, after consuming the Supa Supa no Mi, Achilles' body became as tough as steel itself, thus making it incredibly difficult to actually harm him significantly. In addition, the user is capable of creating blades on any part of their body to attack, or even turn entire limbs into complete blades, allowing to slice through virtually whatever stands in the user's way.

Air pressured slashes are also key with this Devil Fruit, that with enough strength, the user can slice a target without actually touching them, and since every bit of the user can be turned to a blade, it allows for greater versatility in attacks.

The Supa Supa no Mi doesn't have any specific weaknesses, but cutting through the steel skin is still possible, by powerful swordsmen or other powerful individual who can break steel. Other than that, the user suffers from the standart Devil Fruit weakness.

Trivia

 * According to Achilles, the fruit itself tastes like "metal", but was easy to chew.