Read more about Kopaka at: Wikipedia

Official Site: Lego

In the fictional Bionicle universe certain Matoran (workers and villagers) are destined to become Toa: heroic warriors of great strength and power. The Toa's duty is to protect the Matoran and maintain peace in the universe. They usually work together in teams, with each member representing an element. Each Toa has near-complete control over their element, and can access the powers of the more powerful Great Kanohi Masks. As the Bionicle universe is based around a line of action figures, most Toa have appeared in their action figure.

There were once as many as 3,000 Toa in existence, but as of the current time their numbers are down to 54.

The first Bionicle sets created and released were Toa characters, known as the 'Toa Mata'. The war-like appearance of the toys were believed by some Lego "company traditionalists" because it went against Lego's values of "high-quality products, an emphasis on free play and encouraging the imagination, and no modern warfare or violence."

Toa have been around for most of the Bionicle universe's existence. The first Toa to come into existence was Helryx, a Toa of Water. Though she exhibited most of the traits of a Toa of Water, she had a temper and could be stubborn. Though most Toa were once Matoran, it is known that the Toa Mata and Helryx came into being as Toa. Although Toa are, as a rule, heroes, there are some traitors to the code. Toa Nidhiki betrayed Metru Nui to the Dark Hunters. He was later mutated into an insectoid being who served the Dark Hunters. Another traitorous Toa was Tuyet, a Toa of Water from Lhikan's team. She was corrupted by an artifact from her homeland, the Nui Stone, and wished to use its power to rule the universe. She came close to succeeding, and was narrowly stopped by Toa Nidhiki and Lhikan. She was thought to be banished to the Pit. However, it was recently revealed in the official web serial, Reign of Shadows that she was sent to a pocket dimension, which she eventually escaped. Despite the recent takeover by Makuta Teridax, the main antagonist of the Bionicle saga, the Toa continued to operate, albeit in hiding. After Teridax's defeat at the hands of Mata Nui, the Toa migrated to the newly reformed Spherus Magna along with all the other Matoran Universe residents.

Kopaka has not been a contender in any CBUB matches.