Tatsu Tatsu no Mi, Model: Hydra

The Tatsu Tatsu no Mi, Model: Hydra (タツタツの実、モデル：ヒドラ) is a Mythical Zoan-class Devil Fruit that allows the user to turn into a Hydra (ヒドラ Hidora). Tatsu (竜) means "dragon." It was eaten by Codename Hydra.

Abilities
It has been stated that Mythical Zoan-class Devil Fruits have unique attributes to them, unlike the standard Zoan class.

A unique trait of the fruit is that the user isn't restricted to the typical dragon and dragon-hybrid forms. Instead, the user is initially able to become a three-headed dragon, and can grow more heads if needed. Also, if a head is severed, two more will take its place, until there are a total of nine.

As a dragon, the user can breath fire, and is granted powerful claws and fangs as well as a pair of wings. A mighty tail grows as well.

A common misconception is that the fruit has self-regenerative properties, as seen when two heads will replace a severed one. But this does not apply to other limbs, nor does it heal wounds. For example, if a head is damaged but not severed, it won't heal itself. Also, if the real head is severely damaged, all other heads will retract and disappear. Besides this, the fruit is affected by the standard Devil Fruit weaknesses.