Bionix was not built to serve any purpose except to use parts never used on any other Hero in the Factory. Bionix's weapons are a plasma gun and a dual-barreled flame shooter.
As a MOC, Bionix was built to use Bionicle parts not normally used in Hero Factory MOCs, like his lower legs and the armor on his lower legs.
Bionix 2.0 is just one of 24 MOCs I've chosen to be in the HF Advent Calendar. Stay tuned for tomorrow's entry!