In the world of One Piece, no one can deny that Mythical Zoan-type Devil Fruits are the most powerful and dominant. By granting the user the ability to transform into legendary creatures, they provide terrifying strength, allowing the integration of multiple special energies at once.
Among these, Devil Fruits with dragon forms reign on a completely different level, boasting some of the highest destructive power in the series. Let’s take a look at all the Mythical Dragon Devil Fruits that have appeared and understand why they are nightmares for every force.
1. Vegapunk’s Artificial Devil Fruit
User: Kozuki Momonosuke

Technically, this is not a traditional natural Devil Fruit, but the powers Momonosuke gains almost perfectly match those of a real one. The only reason Vegapunk considers this invention a failure is the color, Momonosuke’s dragon form is pink instead of the original blue.
In terms of strength, this artificial fruit grants abilities identical to Kaido’s Azure Dragon (Seiryu) form. Since Momonosuke only recently mastered his dragon form after maturing, he has yet to fully control or maximize its power. Still, it remains a very powerful and iconic artificial Devil Fruit in the story.
2. Uo Uo no Mi, Model: Seiryu (Azure Dragon)
User: Former Yonko Kaido

During the Wano arc, fans witnessed the power of Kaido, known as the “Strongest Creature in the World.” Beyond his supreme Haki, much of his destructive strength comes from this Fish-Fruit Devil Fruit with the ultimate form of an Azure Dragon.
In his Seiryu form, Kaido’s massive body can darken the sky, unleashing streams of scorching energy that incinerate everything. His peak ability is creating fiery clouds that lift the entire Onigashima island into the air.
This mythical dragon form is so overwhelming that only Luffy’s Sun God Nika transformation, after Kaido’s prolonged battles with many top fighters, could finally defeat him.
3. Ryu Ryu no Mi, Model: Kirin (Qilin)
User: St. Limosiv Killingham

With the Elbaf arc, fans finally met new members of the Holy Knights, ruthless warriors with unmatched power. Among them, St. Limosiv Killingham’s Mythical Kirin Devil Fruit stands out.
The Ryu Ryu no Mi, Model: Kirin has an incredibly “broken” ability: it can manifest the dreams or nightmares of any chosen target. This power can create anything from simple food plates to gigantic, dangerous monsters even larger than Elbaf’s giant warriors.
Since this mysterious power seems to have no weaknesses or side effects, fans immediately ranked the Kirin fruit among the strongest Devil Fruits in the entire series.
4. Legendary Nidhogg Devil Fruit
User: Loki

Celebrated as the legendary treasure of the giant island Elbaf, Loki’s power is considered on par with Luffy’s Sun God Nika form, making it a focal point for all One Piece fans. This Devil Fruit allows the fallen prince to transform into Nidhogg, an ancient colossal dragon of unprecedented size. Many claim this is the most devastating power ever seen in the series.
When activating the Nidhogg form, Loki easily grows to a size rivaling the divine elephant Zunesha, becoming the largest flying character in One Piece. Even more terrifying, this mythical dragon can control the weather, summoning storms, thunder, and blizzards. Its energy breath attack is regarded as one of the most destructive moves in manga history.