Kualus

Kualus was the Toa Hagah of Ice. He was formerly one of the six Rahaga.

Toa Hagah
Kualus was a Toa of Ice and a member of the Toa Hagah. He served as a bodyguard on a Brotherhood of Makuta fortress, until they found out the Makuta were not protecting the Matoran. Kualus was captured and turned into a Rahaga when he and the other Toa stole the Avohkii from the Brotherhood.

Rahaga
Kualus was fiercely protective of all flying Rahi, and even spoke in their language at times, adding clicks and whistles to his sentences. He taught this language to Nuju. He used his staff to summon flying creatures or warn them of danger. His boomerang spinners could latch on to a flying Rahi and bring it to him.

Transformation
After they were transformed back into Toa Hagah by Roodaka, Kualus and the others kept watch over her and, despite their mutual hatred, protected her island from being destroyed.

Abilities and Traits
As a Toa of Ice Kualus could create, control, and absorb ice. This also gave him the ability to control ice, create snowstorms, and travel via ice bridge. These abilities were lost when he was turned into a Rahaga, but he regained his powers when Roodaka turned him back into a Toa. He can also speak the language of the flying Rahi.

Tools
Using his staff, Rahaga Kualus could summon flying creatures or warn them of danger by blowing through it and playing it like a flute. He also had a boomerang Rhotuka spinner, which attached to a Rahi and then brought back to him.