[quote=@RyoRyoRyoken]
[@LokiLeo789] On another note, how would the effects of the Pump Pump Fruit [i]look[/i]? I'm having trouble imagining it as anything other than Gear Fourth limb weirdness or Kugi Punches.
[/quote]

[quote=@NachoBachoPacho]
[@RyoRyoRyoken] i'm imagining either the outlines of pistons under his skin, or his body literally generating said pistons. (Sort of like Toge Toge.)
[/quote]

Simple. Mode Pump, his primary form, literally tranfroms his wrist and hand into differently sized piston pumps. His hand and wrist become the piston, which can come in a plethora of sizes, usually 9" to 12" inches. This piston connects to the crosshead which pumps into the connecting rod. 

Mode Out releases the pressure built up by pumping on Mode Pump. He forms microscopic openings on the body that can act like 'valves' for the pressure, working as release points for all the built up pressure in the different body areas. When the pressure is released you can't see any gaping wholes or openings in the body. Some examples of points and purposes on the body could be; The tip of the fist/The palm of the hand, for a damaging boost of force when a melee attack connects with the enemy. Releasing it around the elbow area to propel the arm forwards for boosted speed and force for a melee attack.

Thses can me opened on the heel, he sole of the feet, the shoulder blades, the hands, elbows, the front and back of the knees and so on.