Nunu Rework VFX
Doubt anything will change on this, but I wanted to point out as a Nunu player how off the VFX look on the Sasquatch, Demolisher, and Grungy Nunu & Willump. I don't know how much this was the case with the Akali rework as I don't own skins for her, but if this was the case for her, I'm in support of fixing that to.
On the Sasquatch skin, given it's supposed to be a more forest/earthy/wildlife skin, in stark opposition to the snowy feel, it really doesn't feel right to have the snow particles. I know that some people are pointing out that low cost skins have gotten new VFX before like with Nunu, Evelynn, and Galio. That doesn't mean all of the low tier skins should get that same treatment, but with skins where the base VFX don't make sense, I thought the precedent was set to change them. I think Sasquatch fits that need. You might be able to get by with a simple color scheme change on VFX, but I don't know how hard it would be to find the right color, and it might end up having to be a bit more just so it doesn't look like a solid color too much given you'd be working on a darker color scheme.
For Demolisher and Grungy, it might be possible to get away with a little less of an overhaul on VFX. First off, the issues I'm seeing: Demolisher doesn't feel related to the snow at all, so having the snow VFX come from a hulking behemoth in full plate feels off. This is most notable on the W, with the iron ball glowing blue. The easiest solution I can think of with this is to dim the blue on the W, maybe greyscale it a bit and then add a hint of snow in the splash. This way the W doesn't look glaringly out of place and the rest of the skin can more easily be associated with snow (emphasize a tamed-yeti-brought-to-warfront feel).
For Grungy, the only thing that looks glaringly off, to me at least, is the E. I think there are probably two ways to fix it in a rather low dev cost way. One would be to change the icon above people's heads to look more like icecream so as to distance the patchwork feeling from the cold and snow. The other would be to put the snowflake design found on the W somewhere and put it on the body as well, giving a feel that this imaginary friend was imagined with ice powers, maybe add something in the splash like a snowcoat hanging to give a winter feel as well.
All and all the skins are really good, above what I expected, it's just that it feels rushed and ill-thought out with the VFX. Like it was decided that there wasn't the time to redo enough VFX without trying to adjust anything else or even brainstorm on what to do to make the skin more cohesive in regards to that.
Hope this is heard and at least helps make it a more realistic change.