
Originally Posted by
Behold the Void
The Force involves powerful telekinetic attacks. Kenshin is powerful and strong-willed, but he can't fight the supernatural. Vader can disable him at a distance, while Kenshin NEEDS to be able to get close to use any of his attacks.
As Kenshin is a speed-focused fighter and due to his natural physiology, his body is generally pretty light. Vader wouldn't have any problem force-grabbing him and flinging him around like a ragdoll.
Also, I'm assuming we're speaking of Himura Kenshin as opposed to the Hitokiri Battousai. As the Hitokiri Battousai, he's able to kill, which is essentially what it would take to defeat Vader. As Himura Kenshin, he has two extra attacks that make him quite formidable, but he loses the killing instinct. You can argue back and forth as to whether or not this is a weakness, but remember that Vader is almost completely a cyborg. Incapacitation isn't going to do it.
Returning to the force powers for a bit, Vader is also able to predict the moves before Kenshin makes them. While Kenshin can do much the same with his Hiten Mitsurugi's ability to read an enemy's movements, Vader's techniques are foreign to him and his cyborg body would likely make it more difficult to read, as Hiten Mitsurugi relies on reading body language, of which Vader's would be quite diminished.
Finally, we have weaponry. One block is all it will take for Vader to completely disable Kenshin, as a lightsaber can sheer through a steel katana (or sakabatou in this case) as if it were nothing. Craftsmanship aside, Vader still has the advantage in weaponry.
Really, this is just a mismatch. Generally, pitting supernatural characters against non-supernatural characters (even someone who gets as close to the supernatural as Kenshin does) doesn't go so well for the non-supernatural character. Unless the supernatural character's abilities are completely noncombative, the ability to bend and break the laws of physics generally wins.