Oh, there’ve been so many great Tuyet MOCs lately and this one is no exception! I adore the samurai armour inspiration, it’s so cool that you’ve been able to make it quite historically accurate while maintaining the Bionicle aesthetic, and that mask is a perfect choice too. I’ve never been a fan of its design, but it goes perfectly with the MOC’s appearance.
It’s also been a joy to read through all the background information for the MOC with all your concept art and research! My favourite part is the bit about Raijin. Never thought I’d learn so much from a topic on a Bionicle forum!
Now that I think about it, there are quite many characters with lightning powers that have rings of drum-looking things behind their backs inspired by Raijin’s drums. Besides the ones that you’ve already listed, Enel from One Piece comes to mind:
This character actually served as inspiration for one of my MOCs, a Voriki reimagining, so that’s a nice coincidence!