I like every idea players have given for Zac, but Riot has been working since Zac has come out to get a GREAT skin out for him that players will enjoy. His model is VERY difficult to make any skin for even a simple recolor because of all the stretching and liquid movements of Zac.
{quoted}
disclaimer - Zac skins are a hot topic and we are not able to answer any questions about -when- a skin is coming out or is in the works (or any other skins). I'm here to perhaps shed a little light and let you guys know Zac is not forgotten!
Definitely don't think you're being rude! What I can tell you is that Zac's champ and stretchy tech is very difficult to work with, and that alone increases work time on him a lot. So using a popular community skin suggestion for him, Gentleman Zac - his clothes especially around his arms would have some crazy weighting and stretching issues. And it would also be really weird to see cloth stretching and turning into globs of goo haha I'd love to hear any suggestions on workarounds you may have to mitigate this!
I know "easy" recolored skins have been suggested for Mr. Blob, but then it would seem unfair if say we released a 750RP Bubblegum Zac and have him wait a while for another skin instead of taking the time to make sure we make a super awesome blow-your-mind quality skin for him.
The fact that his model changes for every bit of health he gains/loses they have to put a lot of work into his skins and they dont want to disappoint the countless Zac fans who have been playing him for the 2 years he has been out and have been waiting for a skin.