First of all, I'd like to point out that Mata Nui is never a "Bionicle," but is a bio-mechanical being. "Bionicle" is a portmanteau of the words "Biological" "Chronicles;" Mata Nui is certainly not a story, but a being! ;D
Anyway, Mata Nui has been seen in three forms - as a "great spirit" in the MU, as a mask (when sealed in the Ignika), and as a "toa" in Bara Magna. Pictures can be found here - http://biosector01.com/wiki/index.php/Mata_Nui_(Being)
M74nu1
The "Gold" bionicle's name was Takanuva, the Toa of light.
No, any Mata Nui set is as close as you can get.
Mata Nui, voiced by Michael Dorn.
Mata Nui fort the good guys and Makuta Terridax for the bad guys.
Since the BIONICLE Titans may think to people as well as a favorite set. Or the best one may be an opinion, right? The best sets are the ones with more pieces, such as the master accessory kit, Mahri Nui Deep Sea collection, and more.
The last bioinicle ever made (so far) is Toa Mata Nui
the trader in the new bionicle movie is Metus and Mata Nui holds him by the fist and turns him into a snake.
Mata Nui - M74NU1Stronius - 57RN1SAckar - 4CK4RGVastus - V457U5Kiina - BLUK11Gelu - 73G3LU
It looks like he did in the movie, but at lego.com it says mata nui broke his blade. Besides, Tuma is too cool to die
The Makuta are destroyed by the energy storm and Teridax takes over Mata Nui's body.
In US and Canada: August 2009. For other countries, I'm not sure.