Throwing is one handed and you can toss the star one handed. Ninja is the factor in determining the hit chance, I think it is Ninja vs defence chance(with some weight to distance).
I would say that the other biggest factor is dismount and animal form/mirror image.
I thought you could deathstrike also but for limited damage, this might be handy if your enemy is well versed in standing still waiting for the DS to reduce as you might be able to set them up for something.