why did LEGO make Taka Nuva? what part will he play in the story of bionicle? and why did they make a new toa?

1- To make us buy it, so they get more money.
2- Dunno- Haveta wait and see.
3- To make more money, I just told you.

I agree.

1) Make money...
2) Add to the storyline...
3) Draw in another round of fans...

And as far as what the ToL will do in the story. I'm guessing he'll go up against Makuta. Geez...maybe the ToL will give his own life to defeat Makuta... (eh...tying together two theories!)

Like the others said is my answer. I think he will be the toa that will be lost because he isn't that old to the story. I think he will go in a big battle against Makuta and they attack at the same time and Makuta shatters the Mask Of Light and The toa of light weakens Makuta for the toa.