This guy is called Tahu Nuva Mistika.

Tahu Nuva Mistika was living in an island called Mata Nui.
I'm not sure what happened but they divide the Nuvas in two
unfair(?) groups. One group is Lewa, Kopaka, and Pohatu Nuva
(Phantoka). And others are Tahu, Onua, and Gali Nuva(Mistika).
Tahu Nuva Mistika tured like that. And I don't know.
His weapon is the gun and the rotating blade, his face looks like the ninja, he looks like more gray then red, he has 4 engines(?) to fly(?) on his shoulder and his side, and he can carry Matoran behind him.