Kongu

"Five of us, 5,000 of them. I like your idea of odds, Hahli" -Kongu

Kongu, was once a single love-flying Le-Matoran, then became the Toa Inika of Air and is now the Toa Mahri of air.

Matoran
On Metru Nui, Kongu worked as a chute monitor. He wore a bright bluish Green Ruru, replaced by a bright bluish green Miru later for undisclosed reasons (most likely because his mask broke when being transported to Mata Nui). During Bionicle 2: Legends of Metru Nui, Nidhiki and Krekka threatened him to change the direction of a chute where three of the Toa Metru (Vakama, Matau, and Nokama) were in, he had no choice but reverted it. Later, he was put in a Matoran Pod and was eventually awakened by the now Turaga of Mata Nui.

During the time of the Rahi attacks from Makuta, Kongu became an expert bird wrangler and was appointed captain of the Gukko Force. He led Takua as a second on a Gukko bird into a hive of Nui-Rama to save several Le-Matoran and one Onu-Matoran, Taipu, who had been taken by the Nui-Rama under command of Toa Lewa, who had been taken by Makuta. Kongu flew into the hive while Takua was frantically shooting bamboo Kanoka disks at the Nui-Rama onslaught. But once in, they were trapped with the others. Only by Onua coming in and saving Lewa were they saved. Later, Kongu led the Gukko Force to the aid of the Chronicler's Company at the Kini-Nui.

Toa Inika
After the return to Metru Nui, Kongu left to help find the Toa Nuva. Along with Jaller, Hahli, Matoro, Hewkii, and Nuparu, they traveled south to a land bridge to Karzahni. They were captured and Karzahni made them wear new masks. Kongu rejected his offered mask, deciding to wear a Suletu that they had found earlier. Later, they found a Matoran who had made six canisters centuries before, and they escaped.

Durring their journey by Toa Canister, the band of Matoran were struck by lightning from the Red Star, and were transformed into Toa Inika.

Toa Mahri
The Toa Inika ventured down to Mahri Nui through the labrinth and were transformed into the Toa Mahri by the Ignika. They got new armor and weapons, as well as masks

Powers and Abilities
As a Toa of Air Kongu could create control, and absorb air, as well as many other things.

Inika: Like all other Toa Inika; Toa Kongu Inika had lightning powers with his Air powers, and always had to be used together (i.e. - He could not create a windstorm without it being coated with lightning, or he couldn't make a tornado without lightning inside it).

Mahri: After being altered by the Ignika, Kongu's air powers were reduced to the point of a normal Toa, not having lightning entwined with them.

Mask and Tools
Inika: As a Toa Inika, Kongu wore an organic version of the Kanohi Suletu, the Great Mask of Telepathy, which allowed him to read the thoughts and emotions of others, or project these thoughts and emotions into the minds of other beings.

He also wielded a Laser Crossbow and multi-shot Zamor Launcher.

Mahri: As a Toa Mahri. Kongu wore the Zatth, Mask of Summoning, which called forth any Rahi to his side, though he had no control over whatever was summoned.

In his Mahri form, Kongu used two Cordak Blasters. He chose to used two for one simple reason, which he summed up in two short words: "Two hands."

Lego Press 2007 Description
''Toa Kongu is prepared for undersea action with his two Cordak revolving blasters and his massive body. Get in his way and you’ll learn the real meaning of crossfire!''