Kakuzu | Ninja Escapades - Creation of the Akatsuki Naruto Ultimate Ninja Storm Revolution Guide

Your first fight in the Ninja Escapades is probably the easiest one as well. The reason for that is fairly simple - Kakuzu isn't the strongest character, and Pain is way more effective than him.

Your enemy is a typical melee range fighter and it's there where he's the most effective - you should be extra careful about his grab, which has a deceptively long reach (and like any attack from that group cannot be blocked), as well as his Ultimate Jutsu, which he can grab you with from mid-range. The only worth noting ranged attack at his disposal is trivial to avoid - all you have to do is to simply jump away, or use your Chakra Rush and you will surely emerge without a scar.

Pain is extremely effective versus enemies who happen to be very close to him - you can use his Jutsu (Almighty Push) to stop any ranged attack fired at you, damage the enemy you managed to caught in it, and throw him a few feet back. This maneuver is especially effective when Kakuzu tries to overwhelm you with his attacks - all you have to do is to dodge his attack (use substitution to get behind his back) and active your jutsu.

If you want to receive a bonus, finish the enemy by using your ultimate jutsu.