I have always loved how deliciously retconned into Bionicle lore the Piraka were.
Remember those Makoki stones that were crucial to the plot right from year one? Vezok is the reason those stones ever left a faraway tower, and that they’re even plural stones.
Remember the great kanohi dragon fiasco that summoned the ever-important Lhikan to Metru Nui in the first place? Three piraka let that thing loose.
Remember the tragic story of betrayal and punishment that befell Nidhiki during the toa/dark hunter war? The only reason the dark hunters weren’t all imprisoned or executed was because Hakann made a secret deal with the ever-important Lhikan involving those plot-crucial Makoki stones.