Zack here probably went through the most revisions of his crew. Not only did he start as a different color (teal) but I changed his eyes like a half dozen times, debated endlessly on what his body type and muzzle should be, changed his CM at least once, and saw a few dozen photos of him carrying Jack (and Vic) and being all cutesy with him. Err, anyway, the bodytype thing, yeah like Alex and Jack he started out around as skinny as them, but over the years, he buffed up. It’s like a metamorphosis, but I swear it. But since I’m doing 2007ish designs, he’s as small as Jack and Alex. And no, I have no pictures of that because I can’t be bothered, but you can look at the ones I linked above to get my point across as all those are much later.
 
That curl on his tail is layered above his body as if it was below his body, it would be brushing against a very uncomfortable place.
 
Shirt and overall look is from this photo, CM is a bunch of birds from like, four album covers, but mainly taken from Future Hearts.
 
Anyway, he doesn’t talk much, but he’s nice, skateboards, and carries ponies. What more do you need?