Kuu Kuu no Mi

The Kuu Kuu no Mi is a Special Paramecia-type devil fruit that turns the user into a **Void** **Human.** The fruit allows the user to manipulate the void (aether), allowing them to seamlessly phase through matter. This, when focused, can produce a teleportation-like effect in which the user can position an entryway and exit within a certain distance away from them. This ability can also be used to fire short-ranged blasts of pure energy, though this can only be done after a sufficient amount of space has been bended through the void (space gone through whilst using teleportation or void entries/exits accumulate as stored energy for these blasts.) However it should be noted that such, while only usable after a certain event has occurred, must be conducted by necessity at a point in time not long afterwards.

## Etymology

Kuu comes from the Japanese word for 'Void, Empty, Vacuum'

## Strengths and Weaknesses

The Kuu Kuu no Mi is a unique fruit that allows for a moderately diverse spread of uses, with a fair amount of creativity being able to be implemented through the fruit's power. The fruit allows for both the manipulation of the location of the user, as well as the manipulation of location itself. Though currently unverified as to the extent of this, it is possible that a fully mastered user of the Kuu Kuu no Mi would be able to alter the space of a battlefield itself, it becoming their playground as they appear and disappear in and out of reality as they like within the area. This, for better or worse, is currently a pipe dream though, as such has never been witnessed, let alone heard of.

A situational weakness of the Kuu Kuu no Mi is the necessity to expel excess matter bypassed by the fruit's abilities, which is converted to stored energy within the user. Teleporting repeatedly in a short period of time is incredibly taxing on the user, and they will experience great fatigue if left unchecked for long. This applies less to stationary portals in comparison to constant motion of and within them. The reason why this weakness is situational, however, is the unique ability of dispelling the energy itself. Allowing the user to fire blasts of pure energy, the user becomes able to reinvigorate themselves by constantly expelling the stored energy. They cannot, however, use their teleportation abilities whilst doing this. Additionally, the strength of the blasts differ dependently on what is being phased through by teleportation, with more energy-high matter causing more taxing effects on the user. This, however, also allows for faster storage of raw energy to be expelled if a situation arose in which this would be useful.

Another unique effect of the fruit is that matter phased between can be used as energy for the user's basic functions as well, able to replace former necessities such as sleeping and eating by such means.

The user can store matter phased through at a cap of 100x the user's body weight, elemental force at a cap of 50x the user's body weight, other devil fruit's attacks, regardless of type of damage, at a cap of 8x the user's body weight, and any biological entity at a rate of 10x the user's body weight.

Maw can store each relevant value by half the maximum value of phase. (If user can phase through 10 rocks, he can only use maw to absorb 5 rocks)

As a side note, the fruit can not be used to teleport out of water, or subsequently out of, or forcing the removal of, sea prism stone in any form. If the user attempts to teleport, or teleport through, sea prism or the sea itself, they will be repelled to the nearest surface/space that is in lack of these things. They are repelled, per se.

This effect also applies if one tries to phase through haki, or a haki infused object.

The Kuu Kuu no Mi has several operations of realms that it can work within, with several more being potential due to some of the aspects of the fruit yet not confirmed. As it is a fruit based on the lack of existence rather than something within the realm of existence, it faces some unique drawbacks comparatively to other fruits, though these drawbacks can be turned into proficiencies in themselves if used in a manner that maximizes their effects.

The basic modes of abilities that the Kuu Kuu no Mi provides to it's user, and those that are most easily discovered as well as being the easiest to use right off the bat, are the principles of phasing, teleportation (via portals), teleportation (via long jumps), and that of the collection and expulsion of matter by the transition and conversion of it into pure energy. This fruit should be noted to rely upon and imply heavily the laws of conservation of mass, energy, and momentum

Phasing works in most basic terms as follows: It allows the user to instantaneously change their physical and mental location upon a plane of existence, without the adverse effects of drag or by passing through particles and matter as one would be required to to traverse the distance in a regular fashion. That is, to say, that one could phase through a wall to the other side of it, whereas one without this ability must first physically go through the wall.

Teleportation (Via portals) works in most basic terms as follows: A rift in space (the plane upon which is currently traversed) is created. This is most often done via method of entryways and exitways, meaning that one portal will lead to the location of another. The principle of how this transport works is synonymous to that of phasing, with it being instantaneous and without effect of the plane that is being teleported within. For example, if one were to jump off a small elevated into a portal, with another portal placed by its side, the subject would pass through the first portal and their velocity would carry over to their exit upon the second portal. The velocity of the fall would carry over into the rise of the newly upwards drive, however it should be noted that as the subject teleports within the same plane, they are subject to the same rules/laws of magnetism, gravity, physics, etc. Thus, the speed of one's fall will inevitably not transit in full to their rise, and gravity will pull them back down from their ascent. It should be noted that portals do not take up physical space, as they themselves are not residential of the space they appear to inhabit.

Teleportation (Via Long Jumps) works in most basic terms as follows: A long jump is essentially a phase, but over a longer distance than the average phase. This has merited them to be differentiated in methodology as they take a different average toll on the user. A long jump can be enacted by the user upon himself, a static object, or a willing or subdued biological entity (both sentient and otherwise). Subdued, in this pretext, will furthermore be retailed and defined as a sentient biological entity that is currently less than or equal to 30% their maximum energy capacity and output, or by mechanism with which to restrict raising one's energy output/capacity from a value less than or equal to 30% of their maximum in normalcy. This can be reflective of powers of both physicality, mentality, and separately, willpower. In effect, a long jump will be taxing on the user of the fruit itself, as they anchor themselves as the battery to which the matter passed through seeks to fill, regardless of what is actually travelling through the space indicated in situation. For example, were the devil fruit user to long jump themselves a mile away, they would feel the full effects of their transposition. Likewise, if the devil fruit user were to long jump an ally a mile away, they would feel the full effects of the space that said ally bypassed via the power of the fruit, as the devil fruit user is inevitably the anchor of all such movements within (or rather, bypassing) space.

The Collection and Expulsion of Matter/The Mechanisms of Aether work in the most basic terms as follows:

First regarding the laws by which this fruit most sensitive.

According to the Law of Conservation of Mass - In physics and chemistry, the **law of conservation of mass** or **principle of mass conservation** states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed. Therefore, the quantity of mass is conserved over time.

The law implies that mass can neither be created nor destroyed, although it may be rearranged in space, or the entities associated with it may be changed in form. For example, in chemical reactions, the mass of the chemical components before the reaction is equal to the mass of the components after the reaction. Thus, during any chemical reaction and low-energy thermodynamic processes in an isolated system, the total mass of the reactants, or starting materials, must be equal to the mass of the products.

In physics and chemistry, the Law of Conservation of Energy states that the total energy of an isolated system remains constant; it is said to be *conserved* over time. This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.

According to these, in practice of using the Kuu Kuu no Mi to effectively bypass the mechanisms by which energy and matter functions in a natural state within the world, or perhaps galaxy (I will not assume that these rules of physics would apply in a same fashion farther than this, though perhaps they do), must account for the reallocation of one's mass to a completely different location in space without managing through space itself.

To account for this issue, all matter, and antimatter, must be refueled into the environment around after being effectively navigated past, as not to disrupt the stability of the local area by the defying of such a law of physics. The objective energy value of the matter phased, or teleported, by is stored within the user of the devil fruit. This action itself must also be temporary, as it essentially steals the energy of the local space into a body within which it would not ever naturally exist. So this matter (or energy of the matter, rather) is converted into a form of purified energy, this being furthermore regarded and defined as Aether. Aether is them expelled by the user, reinvigorating the surrounding area with the pure energy as to quench the thirst of nature, parched by the passage of the devil fruit user. While the matter itself is sated, in a more person-oriented context this will not appear to be such a peaceful emprise. The flow of aether appears to be a violent burst of energy to the eye, and while it will always fluently return to the world, or plane around it, it can be momentarily utilized as a force by which to manipulate the matter which it is made to restore to proper form. The current user of the Kuu Kuu no Mi emphasizes this ability and utilizes it often, having discovered this potentially-alleged flaw within the functionality of this power. As aether interacts by form of pure energy, it resembles to it's surrounding the effect of what would effectively relate to that of a shockwave, as it does indeed rely on what could only be detailed as a propagating disturbance and shift of the locality within which it exists. It can be even viewed like such by the user of the fruit, allowing them to manipulate it through the process of expulsion from themselves as a similar power to a shockwave. This can be very loud, reverberating violently within the matter it is expelled upon before eventually dispersing. This utilization can be referred as somewhat ironic to some, as aether itself is often depicted as the manner of energy that holds the world and stars themselves together, responsible in maintaining the functions of what transpires by physics and the like. Perhaps it is because it represents such an idea, that it can itself be used in such a deadly manner.

It should also be remembered, that it is not as if this energy known as aether will sit forever content within the body of the user. It must be expelled, this is not a choice that the user has. Failure to do so in due time would greatly fatigue the user, inevitably resulting in their diminishing existence as a whole, unto death, and for the cells of a body not made to endure such a transpiration, will themselves deteriorate in an...unseemly fashion to say the least.

## Usage (Ability Examples)

* The first power any user of this fruit learns is phasing. The name may vary depending on the user but the ability is a core of the fruit. The user can phase short distances in succession or teleport long distances with a cooldown. Phasing through the air provides a similar effect to Geppo, however it provides instantaneous movement rather than a dashing action. Additionally, it is not as if phasing propels oneself into the air by act of itself, a propulsion can only be attained by obtaining the momentum for such in an alternative fashion. It should be noted that this still stores energy. Additionally, the user will soon after feel their first experience of a need to expel the energy stored due to such action, and will become proficient in this in time as well.
* **Cross Strike:** One of Toltaka's signature moves, Taka creates small portals around his blade, as well as in various locations around the enemy, slashing through them in irregular patterns as to create the notion of one being struck out of thin air, by nothing. (The blade passes through the small portal, and can hit the target outside another)
* **Maw** The user rips open the space in front of them, storing within it anything that attempts to pass through. This ability takes the same toll on the user as if they had phased through the objects themselves, and will subsequently need to release the stored energy afterwards.
* **Aether Blast** The standard name referenced for the action of expelling the user's stored energy. This ability can be manipulated in various ways, however the most simple and efficient method is that of a blast from the palm, or by the mouth in form of a shout as to expel the energy outward.

It should be noted that **Maw** can be used to store Sea Prism and Water. HOWEVER, doing so will cause fatigue on the user at a rate modifier of 8x normal per mass of object. Thus, doing so will noticeably incapacitate the user. This should never be done unless in dire or extremely situational circumstance, as water and sea prism cannot be converted to energy. (When released they will simply drop back out as they came in.)

Additionally, the wielder of the Kuu Kuu no Mi can allow water or sea prism to pass through a portal, though each time they do so they will feel the effect as if the water or sea prism had made contact with they themself.

## Trivia

just pretend like the fruit is dark purple :)

* void and aether are near-synonyms, sometimes used as replacement terms for each other, aether referring to the celestial substance that makes up the world, where void refers to the space of the substance that exists (if that makes any sense)
* alternatively, "quintessence"
* i hate Phys 500 kms
* not to be confused with the Abyss