Den Den no Mi

伝伝のみ aka The Comm Comm fruit - Den generally means ‘communications’, making the user a ‘communication man’.

This devil fruit allows the user to broadcast a variety of signals over long distances, effectively making them a walking telephone. At the base level, this devil fruit serves as a means of communication. After eating this fruit, the user will be able to generate antennae anywhere on their body. These Antennae can generate signals that allow them to direct their thoughts to any individual nearby. This also allows the user to relay thoughts or commands to objects like machines. A benefit of this communication ability is that it allows the user to both relay and receive any language perfectly, making the user a universal translator, so long as the information is being "spoken" in some way.

Using Antennae, the user is able to generate a variety of signals serving more as "commands". For example, the user will be able to generate a signal that disorients those within range. The user, with enough skill, may be able to either implant emotions or completely mind control a target. They could also hijack machines or similar systems to insert new commands or outright cause them to shut down.

The user can also "wiretap", allowing them to tune into signals being generated by others. This specific ability requires a lot of understanding about information, however, as the range of the ability varies depending on what the user intends to hijack. For example, a Transponder snail is easy to tap, the user would only need to tune into the signal. However, a person's thoughts would not only need the user to insert an antenna into a targets head (because generally thoughts are a closed system that are not broadcast), but the user would need to be able to understand how it is thoughts are relayed.

Because the user is able to generate Antennae, they inherently possess a very useful weapon. Antennae can be used as metal spears, being useful both as a melee or a ranged throwing weapon. Because the user can choose the length and size, they can be used as darts or massive, devastating ballista. The added benefit of these objects is that they can be used as signal boosters, increasing the range of the user's ability.

An interesting technique the user can make use of is an ability called "World Web". This technique allows the user to create what seems like a purple web of energy that connects to a target. This web is pure information and can only be interacted with by the user and their antennae. This is extremely useful in ensnaring a target in a material that they cannot even interact with or break, literally ensnaring them in data. When used in tandem with antennae placed around an area, the user may have an ability that almost seems like telekinesis. It should be noted that unless a target is somehow able to tune into the signal of the web, this energy cannot be seen. World web can also be used in leu of an antenna to create a direct yet intangible connection to a target or series of targets. These connections can only be broadcast through the use of an antenna and cannot be wiretapped.

Awakening

Awakening this fruit allows the user to turn any object they touch, including themselves, into pure data to be broadcast. This means that, as information, they can be relayed anywhere they desire. This ability essentially serves as a form of teleportation, being able to "warp" to any desired location that is connected to the user and their receivers

Strength/Weaknesses

This ability is best used in support to ones own combat abilities, allowing a user to essentially set up traps or greatly enhance their field of influence beforehand. After awakening, this ability becomnes far more tricky to deal with, as the user will be able to move anywhere they have previously set up, as well as move anything they touch, making them almost unpredictable.

A key weakness of this fruit is its strength as well. The user heavily relies on their antennae to increase their range. That means that, if the antennae are destroyed or otherwise obscured, or if the user never set them up in the first place, the user's range becomes severely limited. Because of this, a user must be wise in their placement of antennae or even have backups or redundancies.

Another weakness is that signals can be both blocked or tapped by a good enough communications expert, meaning that this ability is not infallible.

Finally, strong wills can resist the transmission of information, with armament specifically being a blocker to the transmission of information between objects due to the energy coating.