Blackbeard is the only character in One Piece with two Devil Fruits. How did he do it? Marshall D. Teach, better known by his epithet, is arguably the most dangerous living pirate in One Piece.
Zoro can eat 3 devil fruits.
No. At present the only person who has, somehow, managed to acquire two devils fruit powers is Blackbeard, and no one knows how he did that.
Also, a person can only have one devil fruit powers. The concept is that once a devil's spirit is already within a person, it will not welcome another devil spirit. There would be an internal conflict so to speak and the person who consumed two devil fruits would inevitably die.
One Piece shows a new awakening of a Zoan-type Devil Fruit, confirming that Luffy's version of this rare and powerful ability is absolutely unique.
The Mizu Mizu no Mi (lit Water Water Fruit) is a Logia-type Devil Fruit that allows the user to control and become liquid water.
The Yami Yami no Mi allows the user to absorb Devil Fruit powers from dead users and assimilate it into their own body, without causing their bodies to explode. It is a "unique" fruit, even for a Logia. Blackbeard somehow caused the Gura Gura no Mi to grow after Whitebeard died, and then consumed it.
In addition, unlike the majority of the most powerful individuals in the world, Roger never had any Devil Fruit powers, which makes him even more impressive.
To everyone's surprise, Luffy, who was always believed to be a user of the Paramecia type Gomu Gomu no Mi, is actually a user of a Zoan type Devil Fruit. Furthermore, this isn't just any Devil Fruit, but a power described to be "the most ridiculous" to exist in the entire story.
One Piece's Wano arc revealed that Luffy actually has the Hito Hito no Mi, Model: Nika Devil Fruit, and it is something special. One Piece's Wano Country arc revealed quite a lot to the fans about the story of Joy Boy and, at the same time, added a lot of depth to Luffy's character.
Luffy's rubber attributes are a result of him eating a devil fruit called the Gum-Gum Fruit Granting him a rubber-like body, his powers make him immune to electric attacks and most blunt forces, but he is susceptible to attacks made with a sharp object or weapon (eg. sword, spear).
Sanji hated Absalom even more because he ate the current Clear-Clear Fruit. This was the only Cursed Fruit that Sanji was ever interested in, he lost however interest in the fruit after his fight with Absalom, deciding that he shall just have to go do them anyway without it.
The Daishou Daishou no Mi is a Paramecia type Devil Fruit eaten by Nefertari Vivi a month after the Straw Hats departed from Arabasta.
The Gura Gura no Mi is considered the strongest Paramecia devil fruit of all for its absolute destructive powers.
Shanks is the only member confirmed to have not eaten a Devil Fruit. Shanks is the only member who is not an Admiral of a Fleet. Shanks is the only member of the original Four Emperors to not be a member of the Rocks Pirates.
Sabo wants to get the fruit to inherit Ace's will. Once Sabo destroyed the colosseum platform, he then grabbed the fruit from off the Fighting Fish's back, and ate it seconds later, becoming the new wielder of Ace's powers.
Imu is the sovereign of the World Government and arguably the strongest character in One Piece. Imu seems to have access to some kind of ability/weapon that allowed him to destroy the Kingdom of Lulusia in an instant.
The Sugi Sugi no Mi, coming from "suigin," Japanese for mercury, is a Logia type Devil Fruit which allows the user to dissolve entirely into a pool of quicksilver. This fruit was eaten by Marine Admiral Calomel.
The Kaze Kaze no Mi is a Logia-type Devil Fruit that allows the user to create, control, and transform into wind at will, making the user a Wind Human (風人間, Kaze Ningen).
The Angel Angel fruit is a Mythical Zoan Devil Fruit that allows the user to turn into a Angel-Human Hybrid. It's one of the most powerful devil fruits in the world. Users of this fruit gain the abilities of an Angel, it's very useful for battles, stealth, ambushes, and sneak attacks.
During Sanji's cooking battle in a Loguetown Arc filler episode, it was mentioned that some fish species that should not exist in the East Blue were found due to ocean currents, which made Sanji certain that the All Blue exists.
In the 98th volume of One Piece, Oda answered a fan question about what Devil Fruits would fit Nami, Zoro, Sanji, Usopp, and Franky best. Nami's Fruit is the Rumble Rumble Fruit, which lets its user wield the power of lightning.
In fact, Nami has already demonstrated abilities similar to Haki. During the Alabasta Saga, she has shown the ability to tell even the slightest of changes in weather which, according to Vivi, is beyond human comprehension.