Jaller

Jaller is a Ta-Matoran that used to live in Ta-Koro where he was Captain of the Ta-Koro Guard. He was also one of the Kohlii champions of his village, the other being Takua. Jaller enjoyed Kohlii and practiced in whatever free time he had, which was very little. He was also romantically involved with Hahli, a Ga-Matoran. He was also one of the two advisors to Vakama, the other being Kapura. He wore a yellow Hau, which was actually Lhikan's.

Pre-Catalysm
Like all Matoran, Jaller originally inhabited Ta-Metru, a Metru of Metru Nui. It is unknown what his occupation was during this time, but it is known he did not where a Hau in the City of Legends. Instead, he wore a Koamu.

Post-Catacylsm
Once arriving on Mata Nui, Vakama fitted Jaller with Lhikan's mask, who had died during the battle with Makuta. Due to the mask's former use, Jaller gained stamina, strength, and courage, leading him to become Captain of the Guard. He helped Takua explore Ta-Wahi during their first year on Mata Nui, though he had no recollection of his past on Metru Nui. Not much is known about Jaller's life on Mata Nui before the arrival of the Toa Mata, but his life afterwards would be remembered by all.

Bohrok War and the Mask of Light.
During the Pahrak invasion of Ga-Koro, Jaller helped the Ga-Matoran defend the village from the Bohrok. He also knew much about the stone Bohrok, one of the primary reasons he was present. During the reign of the Bohrok Kal, Jaller accompanied Tahu with Takua on his search for his lost Nuva Symbol. After the Kal were defeated, he and Takua were exploring Ta-Koro when they discovered the Mask of Light. Althought the Mask chose Takua, Jaller knew his friend would never uphold a resposibility like that, took the job of Herald.

He and Takua went across Mata Nui on Takua's Ussal Crab, Pewku. In an epic battle with the Rahkshi near Kini Nui, Jaller was killed by a Turahk in defence of Takua. He was revived by Takutanuva and was chosen by Vakama as Duty when opening the passage to Metru Nui.

The Return to Metru Nui
Upon return to the island-city, Jaller was put in charge of reconstruction that Dume, who was awakened and the Rahaga had not accomplished. He sensed something was afoot, and, after consulting Matoro and Takanuva, he still did not get an answer. He set up a strike saying that if the Turaga did not tell them what was going on, the work would stop entirely. Nokama then informed the Matoran that the Toa Nuva had lost to the Piraka and presumably dead. Jaller and company along with Takanuva journeyed to Voya Nui.