One of Thor’s defining traits is his hammer, Mjlonir. The reason why he, and only he, can lift his hammer is because it is a powerful weapon, and only those who are worthy can wield it. One of my favorite scenes from the first Avengers movie is when Thor is fighting Hulk, and at one point, Hulk (a big, strong dude who we later see throw a giant Leviathan like it’s nothing) cannot even lift the hammer. And, of course, we all know how in Age Of Ultron, Captain America was able to move the hammer slightly, and later wield it himself in Endgame.
If this proves anything, it’s that Thor isn’t the only one who can meet the criteria to be “worthy.” As I understand it, you have to have purity of spirit, an eagerness for battle, only killing when it’s absolutely necessary, and a desire to do good. People have theorized that non-Marvel characters such as Optimus Prime, Yoda, Forrest Gump, and even Superman could meet these criteria. But what about Bionicle characters?
With the rule about killing, the first thing that comes to mind is the Toa’s code about avoiding killing. Unfortunately, not all Toa meet the other criteria. Vakama had a lot of self-doubt and wasn’t that thrilled about being a warrior/hero, and Kopaka…no offense to die-hard Kopaka fans, but he could be a bit of a jerk at times. And we all know how Tuyet broke the Toa code.
Of all the Toa, I think the ones that could lift Mjlonir are Tahu, Matoro, Lhikan, and MAYBE Takanuva. And non-Toa characters, well…I wouldn’t put it past Ackar or Axonn to be worthy, either.