BIONICLE Heroes/Characters

Playable
In console versions of the game, each Piraka can also be played after they are defeated, though only in their own regions (for example, Vezok can only be played in the "Vezok's Coastline" levels); and they can activate special Piraka constractions. Once the game is completed, the individual Piraka are replaced by Vezon, who can activate not only Piraka constractions but black constractions found in each level.

In the Game Boy Advance version of the game, the six Toa Mata are playable instead of the Piraka, in both their original and transformed Toa Nuva incarnations. Later on, if you go back you can find the Toa Inika Masks and play as the Toa Inika.

Non-playable
Common enemies, which are encountered in each level, include each of the six breeds of Bohrok, Visorak, and Vahki. If the player collects all of the silver canisters in a level, they unlock one of the breeds of a common enemy, which can be viewed between levels.

In addition to the seven Piraka, there are 12 bosses which are unlocked for viewing after they are defeated: each of the six Rahkshi (Guurahk, Korahk, Lerahk, Panrahk, Turahk, and Vorahk), Roodaka, Sidorak, Nidhiki, Krekka, Brutaka, and Axonn.

Players also encounter Balta, a Matoran who lives on Voya Nui. In the game, he speaks in the introductory movie and runs the Shop where the player can purchase items and upgrades. He has Piruk's claws as hands in the intro, but in the upgrade shop, he is seen with his katanas.