A person can only eat a single
Can Luffy take second devil fruits or not? 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. Normally if someone eats a second devils fruit, it'll poison them and they'll die.
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.
The Cerberus Theory, easily one of the most popular within the One Piece community, posits that Blackbeard had already eaten a Devil Fruit before he ate the Yami Yami no Mi. Specifically, a Mythical Zoan Fruit possibly called the Inu Inu no Mi, Model Cerberus.
In most cases, you die. For whatever reason, the body can't support more than one Devil Fruit power, and attempting to eat a second Devil Fruit will cause one's body to explode. The one exception to this rule is Marshall D. Teach, aka Blackbeard.
Zoro can eat 3 devil fruits.
It is possible that Blackbeard consumed the Inu Inu no Mi, Model: Cerberus, a Mythical Zoan-type devil fruit. Since Cerberus is known for having three heads attached to the same body, it would explain how Blackbeard managed to eat two more devil fruits, one for each head.
One of the many snake Fruits seen in One Piece, the Yamata no Orochi version is considered to be the rarest out of them all. It was eaten by the Shogun of Wano, Kurozumi Orochi, and it grants him the ability to transform into an eight-headed serpent, each head having its own personality.
Strengths. As with all Logia-type Devil Fruit, the Mizu Mizu no Mi grants the user the ability to transform into and create a specific element. In this case, Jackson is given the power of transforming into water. This allows Jackson to attack with water, which is one of the primary weaknesses of Devil Fruits.
No, not even close. Luffy's devil fruit is among the strongest devil fruit in the series. It's the ancient Mythical Zoan-type Devil fruit call Hito Hito no Mi, Model: Nika that allows the consumer to gain Nika's abilities.
Every personality can have one fruit. So luffy can't eat another devil fruit and stay alive. The symbol of blackbeard have 3 skulls, so in the future he might eat a third devil fruit. Or probably because he has a sleeping disorder.
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).
In contrast, Zoro and Sanji's Fruits aren't as directly connected to their characters. Zoro would receive Kaido's powerful Mythical Zoan Fish Fish Fruit, which enables its user to turn into a dragon and Sanji would receive the Swim Swim Fruit, which enables its user to swim through solid surfaces like the ground.
As mentioned above, there are four gods in One Piece namely the Sun God, Rain God, Forest God, and Earth God. Although it was revealed that Luffy's Devil Fruit gave him the powers of the Sun God Nika, the identities of other characters with godlike powers are still a mystery.
Unlike most other Devil Fruits, the effects of the Gomu Gomu no Mi are always active, making the user's body permanently rubbery. The user becomes almost completely immune to blunt damage, including hand-to-hand combat, blunt weapons, bullets, and even cannonballs, all of which will just bounce off from his skin.
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.
Hito Hito no Mi, or human human fruit, is a zoan type devil fruit. This fruit's effects on humans are unnoticeable because the effect itself is turning the user into a human. If Sanji ate this fruit, the only ability he would gain is a swimming disability.
Mihawk's strength is so great that Don Krieg accuses him of having the power of a Devil Fruit. While it has not yet been officially confirmed that he does not, it has only been indicated that his abilities are from pure skill and power.
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.
The Hito Hito no Mi was eaten by none other than a doctor of the Straw Hat Pirates, Chopper. This Devil Fruit is incredibly useful for the reindeer as it gives him the powers of a human.
Despite its initial impression, Luffy's Devil Fruit is also a Zoan-type of the Mythical branch, the Hito Hito no Mi, Model: Nika. Luffy's appearance and abilities in awakened form (which he calls Gear Fifth), however, differ greatly from other awakened Zoans shown recently in the series.