Ryu would win. Reasons:
1) He has the ability to use "ninpo" magic
2) He has skill with a bow which means that he could choose to be a coward and attack from afar, like I would prefer to do
3) He is a genuine ninja, not relying on modern technology (he sticks with just katanas, nunchaku, shurikens, and arrows)
4) I actually have no idea who the other two are 😛