User blog comment:13th madman/writing the rulebook/@comment-4759107-20120917104900

After some consideration here are the new Devil Fruit Council Rules. The core principle of these rules is so characters don't get overpowered from eating Devil Fruits or using Devil Fruit items.

Combination Devil Fruit Powers
No combination powers. Combination powers being defined as multiple unrelated powers in one fruit.

Reusing Devil Fruits
Devil Fruits can be re-used, as in someone dying and the fruit being taken or found by someone else. This applies to Canon and Non-Canon Devil Fruits.

Duplicate or Similar Devil Fruits

 * 1) If you wish to use a Devil Fruit that already exists in Canon you may.
 * 2) If you wish to make a Devil Fruit that already exists on the site you may.
 * 3) If you wish to make your own version of someone else's Devil Fruit you may, so long as you ask their permission.

Multiple Devil Fruits Per Universe
No Multiple Devil Fruits will be allowed in the same universe e.g. Kai-De-Avalon Universe (K.D.A.U.) can only have one Mera Mera no Mi. This breaks one of the basic Devil Fruit Principles set out by Oda and therefore will not be allowed.

Water Based Devil Fruits
No water based Devil Fruits, those being Devil Fruits that give the user the power to directly manipulate water. This breaks one of the basic Devil Fruit Principles set out by Oda and therefore will not be allowed.

Particle Logia Devil Fruit
The Particle must have a natural place in the user's world. It must be possible for them to exist naturally and they're properties must make sense based on where they exist.

Mythical Zoan Devil Fruit
The creature or deity must have an established mythology within the user’s universe and a background of where the myth comes from. The myth must make sense within the context of where it is from and why it came about. If the myth already exists in the real world it can be used as a basis for the myth in your universe.

God Type: Mythical Zoan Devil Fruit
God Type Mythical Zoan Devil Fruits will be allowed once more. However with certain restrictions. Certain gods, such as the Christian/Jewish/Islamic god, almighty are not allowed as the abilities that would come with it completely overpowered.

Therefore the following things will not be allowed in Devil Fruits:
 * 1) If a god is omnipotent, they are not allowed.
 * 2) If a god is immortal, they are not allowed.
 * 3) If a god is omnipresent, they are not allowed.
 * 4) If a god is omniscient, they are not allowed.
 * 5) If a god is defined as all powerful (defined as no one able to defeat them), they are not allowed.
 * 6) If a god has a counter-part it will not be allowed in the same universe. e.g. A Zeus Devil Fruit and a Jupiter Devil Fruit will not be allowed in the same universe.

Multiple Devil Fruits Per Character
The One Devil Fruit per Character rule is being rescinded. However until Canon confirms how Blackbeard is able to eat multiple Devil Fruit's, doing so with character will not be allowed. Large numbers of Devil Fruit items owned by one person at one time will be considered overpowered.

No Magic or Alchemy in Devil Fruits
This will once again be allowed, however if the fruit has combination powers then it will still not be allowed.

The rules will most likely be updated and altered at some point in the future. Any rules that are added, removed or altered will be blogged about.