I like how Razor has a dark chao, but is a hero. It seems it has more to do with the attitude of the person raising the chao then their morality that makes them end up on the hero/neutral/dark alignment scale. It's a nice touch. The fact that they're delving into the creatures and rules of Sonic's world like this is something the series has sorely needed for a while.
I also like that they're sonic-izing a lot of animals you wouldn't expect to see in Sonic games. It's a world of anthropomorphic creatures, who says there can't be humanoid sharks and betta fish and manta rays and the like? (Maybe it'll lead to more creative fan characters in the future too. We can only hope.)
Also, there needs to be an off-panel of Sonic jumping over Razor. ;)