Lemme rephrase what I said earlier by being more specific.
Shadow Okotans: Actually these guys are alright, no need to change them
Tahu: He definitely reminds me of Furno XL, he seems pretty generic in color scheme and build. Maybe something a little bit more technic-like for the build would make him better, and try something new for the colors because orange and gold mixed with red is getting pretty old. If they are Eclipsers then why not add more black into them? Also the lightsabers don't work for all of them.
Kopaka: I guess he is pretty good but there appears to be no knee joints so the lower leg half can't go back and forth, maybe fix that?
Onua: looks like his 2015 version except it has armor. It feels way too simple and lackluster, like it needs more construction put into it. I'd expect Lego to make more complicated builds because they had said that they would do that, which they worked towards with the Uniters and tried with the Beasts/UtD but it would've gone more forward if they hadn't ended up cancelling it. If these are supposed to be something Lego made then their efforts should be reflected here.
Lewa: Same thing as Onua except he looks like his 2016 form.
Pohatu: I think his armor and the colors need more work. There's too many things trying to blend in at once. Try having Primary being brown, secondary being Blue like it already is and completely remove the silver. Also one thing that applies to them all is that their weapons are too similar and too... trying to be gimmick-y? Why not try to make them something that can be used as an actual tool similar to what the 2015 and original Toa Nuva pulled off.
Gali: The color scheme is well done, weapons are what I said before, armor is too simplistic, why not try a more jagged design or a design like the shoulder armor Pohatu has?
Karnarohk: I'm gonna be blunt, don't take offense. His color scheme is a total mess and the Umarak mask with the Beast jaw does not work. He looks like a remake of Umarak the Destroyer. Why not try a more original design, villains don't always have to be giant and bruiting. The original villains weren't all like this, maybe this time around Makuta should have some generals instead of one guy giant guy carrying out his will.
Ekimu: He needs to be 100% remade, he looks like a MOC made by a little kid that you'd see on Lego.com's galleries. He went from being all armored and godly to a stick figure. Maybe you could make a redesigned version of his Protector form and pair it with a scaled down better looking Karnarohk. Like make it his smaller form, but it has the armor of a Toa except it's scaled to work with him. So it doesn't look weird.
Takanak: His head looks messed up and ugly with a creature head and a beast jaw, try making a new head, and change the weapons. Everyone's weapons in this wave are almost the same. But the warriors in general would be pretty good with just a few small edits.
Grelnoc: Change the weapons and hands, that's pretty much it.
Sliglak: Weapons and mask.
Makuta: Yes, its a rehash of the JtO combiner. But I'd like to take a moment to remind everyone that if Bionicle hadn't ended we would've gotten that as the set. Except maybe this would've come with the Mask of Ultimate power. Also the effect-thingies on the staff should fade from gold to trans-purple/a fiery type color.
The Shadow Slugs: We'd probably get a single mold for that, but you guys can't really do that so it's fine I guess.