In the 14th issue of the Ignition comics, Lewa and Kopaka are taking amongst themselves in the midst of a battle. Lewa asks Kopaka what he thinks is in the Codrex, and Kopaka says he wants it to be something that shuts Lewa up. To which Lewa says “Ah, Toa of snow and slush, I’d almost ever-forgotten how much fun you aren’t.” It’s clearly meant as a semi-insult to Kopaka, who’s honestly kind of a killjoy.
But it kind of makes me wonder…Kopaka is the Toa of ice, but could his cryokinesis really extend to snow and slush?
Even though we tend to think of snow and ice as separate things, they’re both technically water in a solid state. Snow is made of tiny ice crystals that are all lumped together. It can be used to create snowmen, snowballs, or other snow sculptures. But if snow is really just another form of ice, then maybe Kopaka COULD have control over it. And honestly, the idea of Kopaka generating a bunch of snowballs to throw at the Makuta makes for a very amusing mental image.
Slush is a different case. When hearing “slush,” the first thing that comes to mind is the slushy drinks you get at gas station convenience stores. Those slushies aren’t unlike natural slush, which is snow that’s either partially melted or mixed with water. This is where we run into a problem. A lot of people have quibbled with water and ice being separate elements, since ice is technically water. And if we’ve got a substance that’s both ice and water, then who could control it? Kopaka or Gali? If the substance is more liquidous, then I’d say Gali is more likely.
Of course, something like this did come up in Season 11 of Ninjago. There, we saw Nya exhibit some control over the element of ice because, again, ice is technically water. Even though Ninjago is in an entirely different universe than Bionicle, we have seen some examples of gray area between elements, most notably Earth Vs. Stone. So maybe it would be possible for Kopaka to control slush, since it’s at least partially made of snow/ice. 