Hito Hito no Mi, Model: Colossus

The Inu Inu no Mi, Model: Kerberos (イヌイヌの実 モデル：サーベラス Inu Inu no Mi, Moderu: Kerberaso) is an exceptionally rare and immensely powerful Mythical Zoan type Devil Fruit that allows its user to transform into a Kerberos (a giant three-headed hell-hound) at will. "Inu" is Japanese for "Dog". It was eaten by Crawford Quade, Captain of the Stray Dog Pirates.

Appearance
The Inu Inu no Mi, Model: Kerberos is a dark blue fruit, the size and shape of a fig. It has various swirls on it and it's insides are blood-red and also posses swirls.

Strengths and Weaknesses
Unlike the other types of Zoan Devil Fruits, Mythical Zoan fruits may be the only ones considered impressive, owing to their rarity and the unique powers they bestow upon the user.
 * Human - He has the usual full and hybrid transformation, that are available to all Zoan Devil Fruit users.
 * Full Kerberos - The main strength of this fruit is that it allows the user to transform into a giant, three-headed hell-hound, gaining an extreme boost in strength and durability to match his size at 15 feet tall from ear to paw. His skin becomes somewhat indestructible, almost parallel to Busoshoku Haki, only significant physical force can deal damage to the user in this form. He also becomes immensely powerful, able to destroy solid-stone boulders, or rip apart Marine ships with ease. In this form, the user gains two additional sentient heads, all three can act independently of each other and as a team, giving him an unfair advantage in one-on-one fights. The middle head retains the consciousness of the user, while the outside two have the intellegence of dogs. This form doesn't have any hair, except for it's hackles, so you can clearly see it's coiled muscles beneath it's grey skin.
 * Human / Kerberos Hybrid - In this form the user grows a foot or so taller, and becomes toned with more of an athletes body. A single head of the Kerberos replaces his own, retaining the users natural hair. His skin takes on a grey hue and his muscles become coiled and more defined. This form increases the users brute force and, more significantly, his speed, able to move at Soru-like speeds. The user gains clawed fingers designed for tearing. This form also affects the users personality, becoming more animalistic and instinctual. Adopting a wide, hunched stance in battle.

This fruit has no apparent weaknesses, aside from the standard Devil Fruit weaknesses.