Toa Inika/Toa Mahri

Toa Inika are a set of Matoran from Metru Nui that were transformed into Toa by lightning that descended from the Red Star on their way to Voya Nui. While traveling by Toa Canisters, the Red Star shot out a bolt of lightning, which caused the Matoran to become the way that they are. Their Toa Tools were originally in their Toa canisters. The reason why their masks are organic is because of their origin. Inika literally means energy from a star.

The Toa Inika's Elemental powers are all permanently entwined with lightning. When the Inika masks are removed, a bright lights shines from their faces, making their facial features indistinguishable.

These Toa also have Zamor Launchers and Zamor Spheres, constructed by Velika. Now the Toa Inika arm themselves with Zamor Spheres filled with Energized Protodermis (Which is only used to counter-attack the effects of Antidermis.)

The Toa Inika's masks are organic, as well as alive. Their masks can communicate to them usually through pain, which is why Hahli has headaches whenever she is near the Ignika. This is also the reason why it did not take very long for the Inika to learn how to use their masks: Their masks helped them discover the powers.

The Toa Inika are impervious to Antidermis. The lightning they are charged with counteracts the Zamor Sphere.

In BIONICLE Legends 5: Inferno, the Inika went inside the Nightmare Chamber. As the name suggests, the Toa face their worst fears, in every case, it was losing control of their newfound powers and killing a being. Due to the surreal environment, the 'killed' beings morphed into the Toa Nuva, but then they realized it was all an illusion. The Toa then continued on their journey to the Ignika.

Matoro eventually took the Ignika from Vezon's head, with some aid from Kongu. Once the mask was acquired, the Toa went back to the surface. Unfortunately, the mask was lost and floated down into the sea. Hahli made an attempt to retrieve the mask but started to drown, she was saved by a mysterious Matoran then died upon reaching the surface...

After they go down to Mahri Nui, they are renamed the Toa Mahri.

Trivia
There are many clues that told us about the Toa Inika:


 * He carries a heavy burden. To know so many secrets and be forbidden to share with his friends, even when that knowledge might benefit them (A clue to the Inika). In that way, Matoro has the strength of a Toa (Another clue). I will not add to his burden today. Turaga Nuju speaking about Matoro in Bionicle Adventures 6


 * Six heroes (at first thought to be the Toa Nuva) will one day be called upon to make a perilous journey into the darkest place you can imagine (Voya Nui). They will brave the lightning (With lightning referring to the Toa Inika)... they will walk through the fire... they will stare into the eyes of evil (surely the Piraka), and if they waver even once, they will die. Toa Krakua talking to Toa Vakama in a vision.


 * As past, present and possibly even future Toa.... Talking about when the Toa Nuva the Turaga and the Matoran arrived at Metru Nui. Possibly referring to the six Matoran.