Working backstory:
After the destruction of the island of Mata Nui from Makuta Teridax and his Rahkshi, a rift forms between the Toa Nuva as they try to decide what to do with the island: Should they try to rebuild, or should they venture out to the new, uncertain city of Metru Nui. Most notably, Tahu, who is stuck in his ways, wishes to rebuild Ta-Koro to its former fortress glory, and Kopaka, taking cues from his Turaga, wishes to see to the future of the Matoran in the new world. Toa Eli (named after myself, as 11/12-year-old me would have it) arrives to help restore balace between the seven Toa, their villages, and the island paradise they once called home. Now she's a Toa of Psionics, and I think that's pretty cool. She wears the Konohi Suletu, great mask of Telepathy, and carries the psionic bow & arrow which can allower to manipulate the emotions of her enemies.
PS: Bionicle feet suck.
