1 is fantastic. 3 bears a bit too much resemblance to American Mohawk Sonic for my tastes. 2 is too...droopy? I'm having trouble coming up with the right word, but the spines look like they're sagging from excess weight, and the weird points on the ears and toes are bad. 4 has to be a joke. People accuse Shadow of having a cringy edgelord design, but (even setting aside my nostalgic fondness for Shadow) he looks like a saint compared to that...abomination.