File:Ability Overview Chart.png

Summary
An overview of all stackable abilities. The x-axis is how much of an ability is stacked, and the y-axis is how much an ability changes a stat. This image shows what abilities make the biggest stat changes, and shows how stats change less and less as the player stacks more of an ability.

For another way to look at diminishing returns, see File:Diminishing Returns Chart.png. It shows how the amount each additional ability point adds approaches near-zero.

Formulas
x = Ability Points = 10*Mains + 3*Subs

Quick Respawn % change = (0.99*x-(0.09*x)^2)/45

Bomb Range Up, Quick Super Jump, Run Speed Up, Special Saver % change = (0.99*x-(0.09*x)^2)/60

Ink Recovery Up, Ink Saver (Main) % change = (0.99*x-(0.09*x)^2)/(200/3)

Special Duration Up % change = (0.99*x-(0.09*x)^2)/75

Damage Up, Defense Up, Special Charge Up % change = (0.99*x-(0.09*x)^2)/100

Swim Speed Up % change = (0.99*x-(0.09*x)^2)/120