Their relative power in Melee notwithstanding, I have no doubt that anyone, upon viewing each of them with a balanced perspective would determine that Samus is at least 500% more Ninja than Sheik.phootbags sig is still the best. The only negative is that it compares samus with sheik...
She can jump indefinitely. She can roll into a ball to infiltrate pirate bases without detection. She can swing around with a grappling beam.
Sheik can "vanish". Ooooh, so Ninja.