as it was said before, zac is a very hard champ to mae skins for.
as it was said before, i dont see why not.
yes, pool party is essentially a recolor. but add shorts, goggles, and floaties? perfectly fine.
i get that his body stretches and sways, which is why the skinning process is hard for him, but im sure his shoulders, face, and crotch would be fine.
when he separates, or does his taunt where he turns into a balloon, that seems t be where the problem is. im sure there is a way for them to essentially have a "second skin" to the model. so when he does this specific emote, the floaties and pants are just omitted or drop to the floor. same with the passive. i can definitely see the goggles staying though.
another ideas others have had before that i would love to see are:
Zac in a tuxedo
Chocolate Zac/ Sugar Rush Zac (i imagine either just chocolate, or chocolate with candy sticking out. or some sort of candy/jello)
Vine Zac (remember that one plant alien from Ben10?)
Spooky Zac (like spooky nocturn)
Snowman Zac
Magma Zac
Spaghetti Zac
Garbage Zac
Ice Cream Zac
Sandman Zac (but more like a pharaoh, not the spiderman villain. that wouldnt be too bad either though lol)