I would pick Umbra. I would be really interested in seeing what he's up on Spherus Magna besides guarding the Ignika. If you could become on of Nocturn's species for a day, you would...
Sorry if I didn't make that clear; it will be publically known which mask each member has, so you can select it here. The color / type of mask for a role will only be revealed if a hint is given. Alright. I'll take the Tan Hau.
I would wonder how he would return again to fight the Toa and Glatorian. If Gen 1 Bionicle had not ended in 2010, but had kept going on, you would've...