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First, this is They Wasted a Perfectly Good Plot, not They Wasted a Perfectly Good Character, so a main character's plotline could count under that. Second, ATT may not be the best place for this question. I can now see that you ALSO posted this in "Is This An Example", so I guess I'll respond there.
Edited by antenna_ears
Troper Kirby 0189 added Mata Nui's character arc to They Wasted a Perfectly Good Plot in the YMMV page of BIONICLE, with the following context:
"Mata Nui's character arc in 2009's The Legend Reborn direct to DVD movie has some interesting potential. Having been betrayed by the leader of a rogue faction of nanomachines who were supposed to help regulate his giant mecha body in part because Mata Nui was too busy exploring the cosmos to figure out how to repair the shattered pieces of Spherus Magna as per his designated purpose by the Great Beings, you would think his crash landing onto an alien Mad Max-like culture and being a Fish out of Water with nothing to his name would have served for some solid character development with him learning to befriend those usually beneath him, which would be especially interesting given that Bara Magna had been set up as the inverse of the Matoran Universe. Instead, Mata Nui is already a Nice Guy and almost immediately finds allies to rather easily unite the tribes against the Skrall, with his former status as a Physical God being used mostly for brief mentions here and there rather than part of his struggle."
I have to ask: is this valid? Mata Nui is the main character and, by definition, he can't be wasted. What do you think?