They are nothing but Matoran in Toa Armor.

Nidhiki

Vakama? Vakama?? VAKAMA?!? [Vakama wakes up] Another vision? - View Quote Details on Vakama? Vakama?? VAKAMA?!? [Vakama wakes up] Another vision?
[after Matau shapeshifts into Krekka] I told you to go this way! - View Quote Details on [after Matau shapeshifts into Krekka] I told you to go…
[as Nidhiki, confusing Krekka]‘Maybe sneak-passed! Turn around and go the other way!’ - View Quote Details on [as Nidhiki, confusing Krekka]‘Maybe sneak-passed! Turn around and go the…
[in the Land of Unending Whispers] Hello? Hello, hello? This place seems to be deserted - View Quote Details on [in the Land of Unending Whispers] Hello? Hello, hello? This…
Maybe less vision-dreaming and more Toa-saving! - View Quote Details on Maybe less vision-dreaming and more Toa-saving!
[to Nidhiki] You lost the right to call me brother long ago! - View Quote Details on [to Nidhiki] You lost the right to call me brother…
Do it. - View Quote Details on Do it.
You told me to go the other way! - View Quote Details on You told me to go the other way!
[after transforming into Turaga] This is the way of the Bionicle. - View Quote Details on [after transforming into Turaga] This is the way of the…
Time! That’s excactly what the fake Turaga Dume said. - View Quote Details on Time! That’s excactly what the fake Turaga Dume said.