Ryu Ryu no Mi, Model: Pteranodon

The Ryu Ryu no Mi, Model: Pteranodon is an Ancient Zoan-type Devil Fruit that allows the user to transform into an Pteranodon hybrid and a full Pteranodon at will. It was eaten by King.

Etymology

 * Ryū (竜) is Japanese for "dragon".
 * It could also come from kyōryū (恐竜), Japanese for "dinosaur".

Strengths and Weaknesses
The major strength of this fruit is that it allows the user to turn into an Pteranodon, a large and powerful predator from the prehistoric era. This makes the fruit well-suited for combat purposes, since carnivorous Zoans are said to be fiercer fighters than non-carnivorous ones. It also gives the user the ability to fly.

Trivia

 * King being a calamity of fire and with this form is similar to the Kaiju, Rodan shown in the Godzilla franchise depicted as Pteranodon coming out of a volcano surrounded with fire.