So this is my first time building an actual Bionicle MOC (besides the terrible Matoran sized MOCs I made in 2nd grade).This is my self MOC named Noir and I decided to use a black Akaku as my personal mask. I am really happy with how it turned out, but I realize that it is not the best design. Unfortunately the design of the knees causes the legs to not bend past a 50 degree angle. There is a ball joint connecting the torso to the waist but for display I inserted a three length axle instead of the proper two length axle because the joint does not have enough friction to support the weight of the torso. The axle runs from the torso into a pin hole underneath the waist connection to hold the waist in place. I used a simple Inika torso piece as the base for the chest. However, it has been covered by a lot of armor so it is barely visible. On the arms, I used Nuparu Mahri's upper-arm armor but the axle runs through a pin hole so it does not inhibit the elbow movement. While the arms look ok, I was very happy that I could include movable fingers for the MOC. For the weapon, I just went with a simple long sword. I tried to make the hilt more exciting, but the sword became too heavy for the MOC. Overall, I was going for a TRON look with a black color scheme with neon accents. I really enjoyed building my first MOC, I hope to improve in the future!
EDIT: I wanted to note that I tried to limit my use of system pieces as much as possible. There are a lot of studs and lightsaber pieces used, however.