Onji Onji no Mi

The Sato Sato no Mi is a Logia-class Devil Fruit that first appears in the fanfiction One Sea. It gives the user the ability to transmute his limbs into fists or feet made of hardened sugarcane, increasing damage and power.

Strengths
The first strength is the overall hardness of the sugarcane. Due to it's Devil Fruit nature, the sugarcane it generates is about as strong as bamboo (which is itself one of the strongest plants). Due to this, punches with this fruit equipped have been said to resemble gigantic nails being hammered into the opponent. The second is the increased range of the user. They can easily attack from long distances, and can control the sugarcane's growth, allowing them to freely control it's movement.

Weaknesses
The main weakness (aside from the usual weaknesses of Devil Fruits), is the Sato Sato no Mi's incredible vulnerability to piercing attacks. Any sugarcane-enhanched punch can be easily broken through by a sharp iron and upwards weapon, thus forcing users to be more creative in their attacking strategy.

Usage
Columbus D. Penn uses this fruit similar to Monkey D. Luffy's Gomu Gomu no Mi, or Jolly D. Chris's Clay Clay Fruit, extending his punches in both force and range. After the timeskip, he is shown having gained the ability to even grow explosive spores all over it, though only a certain number can be generated. It also gives Penn a very peppermint-style scent.