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The Rumble Ball is a yellow jaw breaker-like drug developed by Tony Tony Chopper through research.

Usage[edit | edit source]

The "Rumble Ball", when eaten by a Devil Fruit user, temporarily "distorts the wavelength" of the fruit, granting the user new powers that are not possible otherwise. The effect of the Rumble Ball only lasts for three minutes.

Zoan-type Devil Fruit users gain several additional transformations. Before the timeskip, Chopper uses it to gain four more transformations.

Early on, Chopper tended to say "Rumble" (ランブル Ranburu?) before consuming the drug.

After the timeskip, Chopper only needs one for Monster Point, which he originally had no control over. Through his training, he gains the ability to change between six other forms without consuming the drug.

Further information: Hito Hito no Mi

It is currently unknown what the Rumble Ball would do to Logia and Paramecia Fruits.

Side Effects[edit | edit source]

As demonstrated and announced by Chopper, the Rumble Ball is not meant to be used casually, as distorting the nature of a Devil Fruit power is dangerous.

The amount of Rumble Balls taken must be closely monitored. If the user takes a second Rumble Ball within six hours of taking the first, it causes them to lose control of their enhanced powers. In the case of a Zoan-type, they lose control of which form they take when they transform. If a third one is taken within the six hours, the Zoan user transforms into a huge, virtually invincible monster that combines all the attributes of the other forms provided by the Rumble Ball.[1]

The side effects of Chopper overusing the Rumble Ball

This monster form has no known time limit, but is dangerous to friend, foe, and user alike, not only because the user loses their mind and attacks everything in sight, but also because maintaining the transformation requires lethal amounts of energy, which could effectively lead the user to die from fatigue. The only known way to stop this is to disable the user's powers using any Devil Fruit nullifying methods, such as submerging the user in a body of water or bringing them into contact with Seastone (which "emits the same energy as the sea").

However, after training for two years, Chopper is now able to utilize and control the enhanced powers at all times without needing to take the Rumble Ball at all. However, he still needs it when transforming into the monster form, during which he can now stay in control of himself. Notably, when Franky (in Chopper's body) eats a Rumble Ball, he wasn't able to control the monster form and rampaged attacking friend and foe alike.[2]

Trivia[edit | edit source]

A picture of Chopper eating four Rumble Balls

  • According to the SBS, if Chopper eats four Rumble Balls, the author goes wild.[3] In this state, Chopper returns to his Brain Point, but with extreme facial changes: his face becomes rectangular with his cheeks jutting out, his nose growing big, with a toothbrush mustache underneath, and thick lips. He also grows human ears, and his hat turns upside down, and merges with his forehead, with the "X" in the center.
  • While the manga never depicts it, the anime shows Chopper discovering the Rumble Ball by accident after experimenting.
  • According to another SBS, if Ikue Otani ate three Rumble Balls, then she would grow out to be a giant.[4]
  • In the anime, during the first round of the Davy Back Fight's second 3 coin game Chopper took a second Rumble Ball within a matter of minutes of his first wearing off and showed no side effects. This is due to the manga having yet to reveal such side effects when the filler episode came out.
  • The Rumble Ball's name and appearance resembles real-life rum balls, a truffle-like confectionery.
  • Through his development of the Rumble Ball, Chopper is the first Devil Fruit user to artificially augment his Devil Fruit powers. However Chopper is not the only one to do so, as Caesar Clown (by his own admission) used his chemical and scientific expertise to artificially augment the Gasu Gasu no Mi to grant himself new offensive abilities.

References[edit | edit source]

  1. One Piece Manga and Anime — Vol. 42 Chapter 407 and Episode 209, The effects of two and three Rumble Balls consumed are explained.
  2. One Piece Manga — Vol. 67 Chapter 667, Franky lost control after taking one Rumble Ball.
  3. SBS One Piece Manga — Vol. 48, "Very good, sir. → (Picture) When he eats three, his Devil Fruit Powers go wild, but if he eats FOUR Rumble Balls, the author goes wild."
  4. SBS One Piece Manga — Vol. 58, Fan question: "If you ate 3 rumble balls, what would happen? Please draw it. P.N. Chappy-"

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Straw Hat Pirates
Crew: Monkey D. Luffy  •  Roronoa Zoro  •  Nami  •  Usopp  •  Sanji  •  Tony Tony Chopper  •  Nico Robin  •  Franky  •  Brook  •  Jinbe  •  Nefertari Vivi   •  Karoo 
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Abilities
Devil Fruit Based: Gomu Gomu no Mi (Main Techniques  •  Gear Second  •  Gear Third  •  Gear Fourth)  •  Hito Hito no Mi (Rumble Ball)  •  Hana Hana no Mi  •  Yomi Yomi no Mi
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Associated Locations: Goa Kingdom (Foosha Village  •  Mt. Colubo)  •  Rusukaina  •  Shimotsuki Village  •  Kuraigana Island  •  Oykot Kingdom  •  Conomi Islands (Cocoyasi Village  •  Arlong Park)  •  Weatheria  •  Gecko Islands (Syrup Village)  •  Boin Archipelago  •  Germa Kingdom  •  Baratie  •  Momoiro Island  •  Drum Island (Sakura Kingdom)  •  Torino Kingdom  •  Ohara  •  Alabasta  •  Baltigo  •  Water 7  •  Karakuri Island  •  Florian Triangle  •  Kenzan Island  •  Fish-Man Island
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Devil Fruits
Paramecia
Canon: Gomu Gomu no Mi  •  Bara Bara no Mi  •  Sube Sube no Mi  •  Bomu Bomu no Mi  •  Kiro Kiro no Mi  •  Hana Hana no Mi  •  Doru Doru no Mi  •  Baku Baku no Mi  •  Mane Mane no Mi  •  Supa Supa no Mi  •  Toge Toge no Mi  •  Ori Ori no Mi  •  Bane Bane no Mi  •  Ito Ito no Mi  •  Noro Noro no Mi  •  Doa Doa no Mi  •  Awa Awa no Mi  •  Beri Beri no Mi  •  Sabi Sabi no Mi  •  Shari Shari no Mi  •  Horo Horo no Mi  •  Yomi Yomi no Mi  •  Kage Kage no Mi  •  Suke Suke no Mi  •  Nikyu Nikyu no Mi  •  Ope Ope no Mi  •  Shiro Shiro no Mi  •  Wara Wara no Mi  •  Mero Mero no Mi  •  Doku Doku no Mi  •  Horu Horu no Mi  •  Choki Choki no Mi  •  Gura Gura no Mi  •  Kira Kira no Mi  •  Woshu Woshu no Mi  •  Fuwa Fuwa no Mi  •  Mato Mato no Mi  •  Fuku Fuku no Mi  •  Hobi Hobi no Mi  •  Buki Buki no Mi  •  Guru Guru no Mi  •  Beta Beta no Mi  •  Zushi Zushi no Mi  •  Bari Bari no Mi  •  Nui Nui no Mi  •  Giro Giro no Mi  •  Ato Ato no Mi  •  Jake Jake no Mi  •  Pamu Pamu no Mi  •  Sui Sui no Mi  •  Ton Ton no Mi  •  Hira Hira no Mi  •  Ishi Ishi no Mi  •  Nagi Nagi no Mi  •  Chiyu Chiyu no Mi  •  Soru Soru no Mi  •  Mira Mira no Mi  •  Pero Pero no Mi  •  Bisu Bisu no Mi  •  Bata Bata no Mi  •  Buku Buku no Mi  •  Kuri Kuri no Mi  •  Shibo Shibo no Mi  •  Memo Memo no Mi  •  Mochi Mochi no Mi  •  Hoya Hoya no Mi  •  Netsu Netsu no Mi  •  Kuku Kuku no Mi  •  Gocha Gocha no Mi  •  Oshi Oshi no Mi  •  Kobu Kobu no Mi  •  Toki Toki no Mi  •  Juku Juku no Mi  •  Maki Maki no Mi
Non-Canon: Goe Goe no Mi  •  Hiso Hiso no Mi  •  Kama Kama no Mi  •  Kachi Kachi no Mi  •  Nemu Nemu no Mi  •  Mini Mini no Mi  •  Atsu Atsu no Mi  •  Noko Noko no Mi  •  Ami Ami no Mi  •  Kopi Kopi no Mi  •  Mosa Mosa no Mi  •  Modo Modo no Mi  •  Gutsu Gutsu no Mi  •  Peto Peto no Mi  •  Kone Kone no Mi  •  Moa Moa no Mi  •  Kyubu Kyubu no Mi  •  Maji Maji no Mi  •  Nito Nito no Mi  •  Hore Hore no Mi  •  Nuke Nuke no Mi  •  Koro Koro no Mi  •  Jara Jara no Mi  •  Iro Iro no Mi  •  Goru Goru no Mi  •  Raki Raki no Mi  •  Nepa Nepa no Mi  •  Mono Mono no Mi  •  Bijo Bijo no Mi  •  Ute Ute no Mi  •  Pocha Pocha no Mi  •  Bana Bana no Mi  •  Deri Deri no Mi  •  Dero Dero no Mi  •  Basu Basu no Mi  •  Gasha Gasha no Mi
SBS: Gero Gero no Mi  •  Samu Samu no Mi  •  Muzu Muzu no Mi, Model: Kokan
Zoan
Canon (Natural): Ushi Ushi no Mi, Model: Bison  •  Hito Hito no Mi  •  Tori Tori no Mi, Model: Falcon  •  Inu Inu no Mi, Model: Dachshund  •  Mogu Mogu no Mi  •  Inu Inu no Mi, Model: Jackal  •  Uma Uma no Mi  •  Neko Neko no Mi, Model: Leopard  •  Zou Zou no Mi  •  Inu Inu no Mi, Model: Wolf  •  Ushi Ushi no Mi, Model: Giraffe  •  Ryu Ryu no Mi, Model: Allosaurus  •  Hebi Hebi no Mi, Model: King Cobra  •  Hebi Hebi no Mi, Model: Anaconda  •  Tori Tori no Mi, Model: Phoenix  •  Hito Hito no Mi, Model: Daibutsu  •  Kame Kame no Mi  •  Sara Sara no Mi, Model: Axolotl  •  Mushi Mushi no Mi, Model: Kabutomushi  •  Mushi Mushi no Mi, Model: Suzumebachi  •  Zou Zou no Mi, Model: Mammoth  •  Tori Tori no Mi, Model: Albatross  •  Inu Inu no Mi, Model: Tanuki  •  Inu Inu no Mi, Model: Kyubi no Kitsune  •  Hebi Hebi no Mi, Model: Yamata no Orochi  •  Ryu Ryu no Mi, Model: Spinosaurus  •  Ryu Ryu no Mi, Model: Pteranodon  •  Ryu Ryu no Mi, Model: Brachiosaurus  •  Ryu Ryu no Mi, Model: Pachycephalosaurus
Canon (Artificial): Artificial Devil Fruit  •  SMILE
Non-Canon: Tori Tori no Mi, Model: Eagle  •  Inu Inu no Mi, Model: Bake-danuki  •  Batto Batto no Mi, Model: Vampire  •  Tori Tori no Mi, Model: Nue
Logia
Canon: Moku Moku no Mi  •  Suna Suna no Mi  •  Mera Mera no Mi  •  Goro Goro no Mi  •  Hie Hie no Mi  •  Yami Yami no Mi  •  Pika Pika no Mi  •  Magu Magu no Mi  •  Numa Numa no Mi  •  Gasu Gasu no Mi  •  Yuki Yuki no Mi
Non-Canon: Toro Toro no Mi  •  Pasa Pasa no Mi  •  Ame Ame no Mi
Undetermined Class
Canon: Tama Tama no Mi
Non-Canon: Zuma Zuma no Mi  •  Meta Meta no Mi
SBS: Ero Ero no Mi
Related Articles
Deterrents: Seastone
Researches: Rumble Ball  •  SAD  •  Lineage Factor
Races: Zombies  •  Newkamas  •  Centaurs  •  Satyrs  •  Harpy  •  Toys  •  Homies
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Doctors
Canon: Nako  •  Crocus  •  Kureha  •  Hiriluk   •  Tony Tony Chopper  •  Isshi-100  •  Ho  •  Potsun  •  Muret  •  Doc Q  •  Kurotsuru  •  Kyukyu  •  Marco  •  Hogback  •  Trafalgar D. Water Law  •  Marie   •  Belladonna  •  Muchana  •  Fishbonen  •  Aladine  •  Tegata Ringana  •  Miyagi  •  Tristan  •  Époni  •  Masked Deuce  •  Gerd
Non-Canon: Zabal  •  Kobato  •  Nightin  •  Whitejack  •  Kiruko
Related Articles: Drum Island (Doctor Hunt)
Abilities
Devil Fruit Based: Hito Hito no Mi (Rumble Ball)  •  Tori Tori no Mi, Model: Phoenix  •  Ope Ope no Mi
Fighting Style Based: Haki  •  Fish-Man Karate  •  Fish-Man Jujutsu  •  Electro  •  Kanpo Kenpo 
Weapon Based: Kikoku
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