Kiri Metru:

Kiri was a balladeer from Ga-metru. slightly eccentric,
but she had a beautiful voice and an unsurpassed musical
skill.

she was the last matoran to be given a toa stone by 
Lhikan before he was kidnapped. along with the stone, he
gave her strict instructions to never be seen by the
other toa. he feared that the notion of a toa without
a specific region to be clearly tied to would create
suspicion and fear amongst the matoran, but he doubted
the other six toa's skills.

Kiri's weapon is different from the other toa's in the
fact that she didn't choose it from the weapon box in
the great temple. the energy from the toa transformation
turned her mandolin into a large guitar. this guitar can
be wielded as a meelee weapon (a la FLCL,) or it can be
reconfigured into a long-range Kanoka rifle. when in
rifle mode, she canhit targets up to 2 mioo away, using
the right kanoka.

Kiri wears the Great mask of molecular reconstitution.
the power of the kanohi keeps her unstable energy fields
under control, and she can tap into her kanohi's power to
warp nearby objects and enemies.