Zack

Zack (ザック) is second-in-command of Team Baron. He is Kamen Rider Knuckle (仮面ライダーナックル), the second Armored Rider of Team Baron. In his first Inves Battle, he shown using the Matsubokkuri Lockseed. He later received a mass production Sengoku Driver and a Kurumi Lockseed from Kaito during his capture and escape from Yggdrasill. With the Sengoku Driver and Lockseed he received, he transformed into Kamen Rider Knuckle (仮面ライダーナックル).

History
To be Added

Personalty
Zack serves as second-in-command in Kaito's absence. He is an excellent dancer and loyal to Kaito. While in an Inves Game, he and Peco set up a cheat in order to make Team Baron as a winner by making the opponent's Inves gone berserk though their actions were detected by Kaito whom furiously break his slingshot, restricting them from cheating again.

Arms
Like with the other Armored Riders, Kamen Rider Knuckle's forms are called Arms (アームズ).

Devices

 * Sengoku Driver - Transformation device. Unlike other Armored Riders, Knuckle's Sengoku Driver does not have a faceplate on it due to it being a mass production type.
 * Lockseeds - Gives access to Knuckle's form changes, depending on which arm the lock is.

Portrayal
Zack is portrayed by Gaku Matsuda (松田 岳).