About Bane Bane no Mi
The Bane Bane no Mi is a Paramecia-type Devil Fruit that allows the user to turn their limbs into springs, making the user a Spring Human (バネ人間, Bane Ningen?). It was eaten by Bellamy.
The power of the fruit was hinted at with the state of the site where Roshio was defeated. The fruit's actual power was revealed when Bellamy and his crew attacked the leaders of the Saruyama Alliance in order to steal Mont Blanc Cricket's gold.
The major strength of this fruit is that it gives its user the ability to transform parts of their body into springs. By turning their legs into springs, the user can launch themself at high speeds, often moving too fast for the opponent to see, similar to Kuro's Shakushi. The user is then able to launch themselves towards the opponent suddenly, allowing for greater momentum.
Strengths and Weaknesses
The damage caused by Bellamy bouncing off the ground and buildings with Spring Hopper.
The major strength of this fruit is that it gives its user the ability to transform parts of their body into springs. By turning their legs into springs, the user can launch themself at high speeds, often moving too fast for the opponent to see, similar to Kuro's Shakushi. The user is then able to launch themselves towards the opponent suddenly, allowing for greater momentum.
Due to the reactive force of bouncing off a solid surface, the user can break apart said surfaces, as the Going Merry was split in half as a result. By applying this ability to other parts of the body, such as the arms, the user can also create strong, longer-ranged punches.
Bellamy is defeated the moment he tries to launch himself into Luffy.
One weakness of this fruit's power lies within the self-propulsion by turning the legs into springs; the user can only be propelled in a straight direction, making it easy for the opponents to predict the user's trajectory and counterattack, and if they do, the user's current speed can cause said counterattack to become more severe.
Also, the user requires both solid surfaces and sufficient space to allow for optimal movement. Therefore, the potential of this fruit is dependent on the nature of the battlefield; spaces with walls and open floors may serve more useful than enclosed spaces or flat grounds. Lastly, the destructive nature of the bouncing may cause unwanted collateral damage depending on the power of the bounce.
Other than that, this fruit has the standard Devil Fruit weaknesses.