Mystery Pack

Mystery Packs, also known as Blind Bags, are small plastic bags that contain Tenkai Knight Minifigures, sold with 3 or 4 pieces per pack: a core brick, a helmet/head, and the other part vary, but all packs include a weapon, or a figure that is capable of turning it's own body into a weapon. These are currently  released in the Western world and in Korea.

Anime
It is unknown if any of these figures will appear in the anime.