Tahu - the corrupted Uniter of Fire
What if things had turned out differently ? What if Umarak had used his Shadow powers to take control of the Toa ? I've wanted to use the red / trans-neon green Unity Mask of Fire for a while, and it's when I bought a pair of Technic Modular Connectors on BL in March that I decided to build a corrupted Tahu. You can spot one of these in the middle of the torso, below the chestplate.
It doesn't look as good on the photos as in real life, so I may have to take some new pics later.