The Zaku II Kai or Zaku II Fz is a Zaku used by the Cyclops Team in Gundam War in a Pocket. This unit is what Bernard Wiseman used in the OVA. It is a upgraded Zaku II with more firepower and speed in exchange for less armor.
In game, the Zaku II Kai differs from the Zaku II Kai (B-Type) in both it's head shape and secondary weapon. The Zaku II Kai equips a new-type of grenade while the (B-Type) uses a sturmfaust. While doing less damage, the normal Zaku II Kai's grenades deploy and reload far faster and so can be used to great effect. Combine the grenades with a bazooka for stuns and enemy MS will fall rapidly. Other than that, the Zaku II Kai plays identically to the (B-type). (Let it also be noted that the normal Kai's grenades do not stagger friendly MS when misfired)
The Zaku II Kai's pre-game lobby icon is a blue Zaku head with the letters "FZ" in the bottom-left corner.