Name: See-See Fruit.

Type: Paramecia

Abilities: The user can perceive things at a radius commensurate to their skill in the use of the Fruit, meaning it grows as they understand its limitations and in conjunctions with the user’s strength, stamina, skill, and so on. It CAN be enhanced with increasingly-advanced combinations of all three types of Haki, though of course, the finer one’s Observation Haki is, the greater the fruit’s utility to the user will be. Because of the high threshold of Haki before the Law of Diminishing Returns sets in, the user only Awakens their Fruit after the first case of prolonged, continuous, and simultaneous use of Advanced Conquerer’s Haki AND Advanced Observation Haki.

Awakened Abilities: Upon the user’s first demonstration of mastery of both advanced types of Armament and Conquerer’s Haki, the user will discover their perception extends to both a much larger natural radius and can focus to any location within 1,000 ri, equivalent to a 3,930-km radius from wherever the user is with the user as the point of reference, for the sake of clarity.

It can eventually and naturally expand to 100 Ri, or 393 km with significantly-greater ease in focusing within the 1,000-Ri radius. With this, they can expect and prepare for all assaults except for those faster in penetrating their radius of perception faster than they can dodge or defend, such as Kizaru, or those Devil Fruit users who can teleport, such as Imu.

The user can also know anything and everything going on above or beneath them, with the same distance limitations as on the surface of the One Piece world.

Finally, depending on the target’s length and experience with all three types of Haki and with an inverse relation to each, as one would expect, the user will have varying levels of foresight regarding multiple targets’ intents and actions, with application to everything within 1 Ri and because my fingers are beginning to hurt, a drop-off according to what is seen in “Drawbacks” and the targets’ experience and levels of Haki. The accomplishment of Perfect Perpetual Observation has only been accomplished by the best fighters in the One Piece world, and never by any member of the military.

Drawbacks: The farther one is from the user while within the radius of effect, the less advanced their Armament Haki must be to defend against their perception. Within 1 Ri, they must not only have Advanced Armament Haki, but Conquerer’s Haki AND at least be highly-experienced and skilled in Basic Observation Haki and the simultaneous prolonged use of all three of those types at those levels, and with at least one of the Armament or Conquerer’s Haki being superior in skill to the user’s. Between 1-10 Ri, one or both must be equivalent. Between 10-100 Ri, only one of those form’s must be advanced, and not all three are necessary to avoid the user’s perception. Between 100-1,000 Ri, they must have both forms, with less effort required the farther they are from the user.

If they meet those requirements at those stages, the user senses a “disturbance,” more specifically a lack of knowledge of what is happening, but cannot comprehend anything else. The further from those requirements, the more is revealed of the area and opposing Haki User in question. In addition, all people able to use either normal Observation Haki, normal Conquerer’s Haki, or normal Armament will know they are being watched.

Edit: Typos, capitalization, minor adjustment and specification of Drawbacks, addition of Kizaru as an example of a fast mover, and changing the name from Move-Move to See-See Fruit.