Every Devil Fruit in One Piece strips its eater of the ability to swim, but a handful come loaded with extra baggage on top of that shared weakness. Some of these drawbacks are cosmetic annoyances, others quietly cap how strong the power can ever get, and a few make the fruit close to worthless without the right owner. Here is how seven of the most notorious side effects stack up against each other.
Devil Fruit side effect tier list
Fruits are graded on how badly the side effect limits the user, not on raw combat strength. A fruit can be devastating in the right hands and still land in a high tier here because its downside is severe or permanent.
| Tier | Devil Fruit (User) | Core side effect |
|---|---|---|
| S | Hito Hito no Mi (Chopper), Jake Jake no Mi (Kelly Funk) | Provides no benefit on its own |
| A | Hobi Hobi no Mi (Sugar), Kage Kage no Mi (Gecko Moria) | Permanent cost or hard external dependency |
| B | Sube Sube no Mi (Alvida), Beta Beta no Mi (Trebol) | Constant handling problem or grotesque body change |
| C | Yami Yami no Mi (Blackbeard) | Takes double damage from attacks |
S tier: fruits that do nothing by themselves
The Hito Hito no Mi is the Human-Human Zoan, and it earns the top spot because it is literally defined as useless for almost anyone who is not Chopper. A Zoan’s whole value is turning into an animal or a hybrid, but this fruit only grants baseline human intelligence. If a regular person eats it, they gain nothing and still lose the ability to enter the sea, the worst trade in the entire power system. Chopper only makes it work through his own inventions like the Rumble Ball, and by the end of the story he is on track to become the greatest doctor the world has seen.
The Jake Jake no Mi sits right beside it. This Paramecia lets Kelly Funk turn himself into a jacket that someone else wears, acting as a proxy for his boxing skill. The catch is that whoever wears the jacket still controls where they move and what they do, so the fruit adds no value when there is no one around to put it on. In a straight one-on-one fight it does essentially nothing, which is why it regularly tops the list of the worst fruits in the series.
A tier: a permanent price or a fragile dependency
The Hobi Hobi no Mi is one of the most underrated powers in One Piece. With a single touch, Sugar can turn anyone into a toy, erase all memory of that person from everyone who knew them, then bind them to a contract that forces them to work against their will. That made her the linchpin of Doflamingo’s entire operation on Dressrosa. The permanent cost is steep, though. The user stops aging at the moment they eat the fruit, which is why Sugar has the body of a small girl despite being a grown adult chronologically and mentally.
The Kage Kage no Mi gives Gecko Moria full control over shadows, an ability strong enough to revive Oars and to power him up with Shadows Asgard during Thriller Bark. The problem is its dependency on an outside resource. Strip Moria of any shadows to manipulate and the fruit becomes completely inert, which is exactly what happened when Doflamingo cornered him during the Marineford War. On top of that, the shadows he commands are not fully obedient and can act on their own, even against him.
B tier: constant handling problems
The Sube Sube no Mi is quietly powerful on defense. It makes the user’s skin so smooth and slippery that physical attacks glide right off, and it sheds the eater’s body fat while keeping their strength, leaving a lean frame. That same slipperiness is the drawback. Basic movement becomes a chore, which is why Alvida wears special shoes to keep from sliding around. Lose those shoes or lose your footing and it is nearly impossible to stand steady again.
The Beta Beta no Mi hands Trebol limitless mucus, sticky enough to pin a ship in place and genuinely annoying to fight through. The downside is written all over his character. The fruit coats him in slime, turning his clothing and entire appearance into mucus and leaving him a grotesque, slippery mess. It is a functional combat tool with a repulsive cosmetic cost.
C tier: a strong fruit with a real risk
Blackbeard’s Darkness Logia is often argued to be the strongest fruit in the series. It offers unlimited storage, gravity manipulation, and, most importantly, the power to negate other people’s Devil Fruit abilities on contact. That last trait alone makes it terrifying.
Its side effect keeps it out of the higher tiers because it is a self-inflicted vulnerability rather than a limitation on the power itself. Unlike most Logia users, Blackbeard gets no intangibility. The gravitational pull of darkness draws attacks in, and as a result he takes double the damage from any hit that lands. The upside is enormous, but so is the risk every time he is struck.
How this was ranked: fruits are placed by how much their side effect restricts the user, weighing whether the drawback is permanent, dependent on outside conditions, or merely cosmetic. This tier list reflects the story as of the ongoing Final Saga. The takeaway is that a fruit’s headline power rarely tells the whole story. The Yami Yami no Mi can flatten opponents yet doubles the damage its owner takes, while the Hito Hito no Mi looks harmless and turns out to be the most wasteful pick anyone could make.
