Thanks! As it stands, we don't really offer a solution for that with this bundle, though it might be included in future packs.
The Ninja Adventure pack was designed independently of those other packs, but it would be technically feasible to "adapt" them quite easily, the main steps would be adding a 2px outline (it's currently 1px) and adjusting the color palette.
The ninja assets are generally smaller, but I imagine it's possible to find a workable combination.