#Ryu Ryu no Mi, Model: Allosaurus
The Ryu Ryu no Mi, Model: Allosaurus is an Ancient Zoan-type Devil Fruit that allows the user to transform into an allosaurus hybrid and a full allosaurus at will. It was eaten by X Drake.
The major strength of Drake’s fruit is that it allows him to turn into an allosaurus, a large and powerful predator from the prehistoric era, making him much better suited for combat than basic Zoans.
While in full allosaurus form, Drake’s own size increases, making him bigger than a Pacifista. He is also granted a strong biting ability that can even damage the heavy armor of the aforementioned Pacifistas, which are said to be stronger than steel. His tail is also a powerful weapon, capable of slamming people with great force. In hybrid allosaurus form, Drake becomes smaller, but still relatively large, and is capable of wielding his signature weapons for melee combat.
#Hebi Hebi no Mi, Model: Yamata no Orochi
The Hebi Hebi no Mi, Model: Yamata no Orochi is a Mythical Zoan-type Devil Fruit that allows the user to transform into a hybrid and full version of the Yamata no Orochi, an eight-headed serpent. It was eaten by Kurozumi Orochi.
This fruit grants the user eight separate, extremely long-necked heads, each one capable of speech on their own. It appears that the user has some degree of control about the number of heads that can sprout at once, with eight being the maximum limit. Curiously, some of Orochi’s human form features, such as his crown and mustache, are present only in one of the heads.
In this form, the user is able to bite opponents with a considerable amount of strength and range, the latter due to the elongated necks.
The user also has a fair amount of durability in their transformed state, with Orochi being capable of sustaining damage from a ceiling collapsing on his head with few repercussions.
#Zou Zou no Mi, Model: Mammoth
The Zou Zou no Mi, Model: Mammoth is an Ancient Zoan-type Devil Fruit, which allows the user to transform into a mammoth hybrid and full mammoth at will.
It was eaten by Jack, who’s an All-Star of the Beasts Pirates, one of Kaido’s three right-hand men, known as the Disasters, and the captain of the Mammoth.
The full mammoth form granted by this fruit gives the user a massive frame, significantly increasing Jack’s already abnormal size. Jack can level buildings with a single swing of his trunk and leave imprints of his feet on the ground just by stepping on it.
#Ryu Ryu no Mi, Model: Brachiosaurus
The Ryu Ryu no Mi, Model: Brachiosaurus is an Ancient Zoan-type Devil Fruit that allows the user to transform into a brachiosaurus hybrid and a full brachiosaurus at will. It was eaten by Queen. The major strength of this fruit is that it allows the user to turn into a brachiosaurus, granting them an immense boost to their size and bulk. Their size is comparable to that of a giant, as a fully-transformed Queen is shown to tower over Big Mom, who herself is extremely tall at over 8 meters.
Due to the signature long neck of the brachiosaurus, the user is able to reach targets that may be further away than they can normally reach or in mid-air by chomping down on them. The user’s immense weight can be used as a weapon, as very little will be able to withstand the crushing pressure of their massive transformed body. Like other Ancient Zoans, this fruit appears to grant enhanced durability, as seen when Queen quickly got back up after taking a beating from Big Mom, one of the most powerful combatants in the entire world.
#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 a pteranodon hybrid and a full pteranodon at will. It was eaten by King, who’s supposedly the strongest Disaster of the Beasts Pirates.
A user of this fruit’s power is able to turn into a pteranodon, a large and powerful, flight-capable reptile from the prehistoric era. When transformed, they become able to travel through the air at tremendous speed, covering large distances within short time spans, and enjoy a significant boost to their overall physical parameters, as to be expected of a predatory Ancient Zoan type. Additionally, the full-beast form as displayed by King is notably big, several times larger than an average-sized human (though it is worth noting that King is already much larger than normal people in his humanoid form).
The combination of great (flight) speed, strength, and size conferred by the transformation allows the user to cause notable damage to whatever they fly into beak-first, both to objects and living beings, their beak representing a strong and sturdy pointed weapon.
#Uo Uo no Mi, Model: Seiryu
The Uo Uo no Mi, Model: Seiryu is a Mythical Zoan-type Devil Fruit that allows the user to transform into a hybrid and full version of an Azure Dragon at will. It was eaten by Kaido.
In his full Beast Form, Kaido grows to rival a small town in size, making this the largest yet-seen Zoan transformation.His hybrid form, while not as colossal as his full dragon form, is nonetheless very large, more so than his human form.
As with all Zoans, the transformation significantly boosts the user’s physical abilities. The full dragon form’s strength befits its sheer size, as the user can severely damage structures like houses merely by brushing by them. The scales covering the user’s dragon body are noted to be extremely durable. Blows of incredible power, including ones strengthened by regular Busoshoku Haki, have proven utterly ineffective at hurting Kaido.
Beside the transformation itself, the fruit grants multiple supernatural abilities, the most out of any Mythical Zoan seen so far. The most prominent of these is the power to conjure forth Flame Clouds, with which the user can travel through the air by using them as footholds, effectively enabling flight. Said clouds can also be used to lift other objects, including entire islands, into the air and move them, for extended periods even and while using their other powers simultaneously.anifest (or at least maintain) Flame Clouds.
In addition, the user can create and control various elements as a dragon. Most commonly seen is a concentrated, scorching blast of fire that the user breathes out, which can travel many kilometers in the span of seconds and instantly decimate large, earthen structures. Aside from flames, the user can launch small lightning bolts while roaring and cutting blades of wind while blowing, as well as stir up potent, fast-rotating tornados. With such attacks able to travel great distances quickly, the user can overwhelm opponents in battle by hovering in the air out of reach and assaulting them at long range.