All slinkwight have a reptilian appearance to them. The only physical characteristic that all slinkwight have in common is the fact they all have a tail of some kind. If you find slinkwight in a swamp, you might find they have a crocodilian appearance. While a more arid desert area may have bearded dragon slinkwight roaming. And in a jungle, you may find newt slinkwight near the damper areas.
Additionally, there is one subspecies of slinkwight that has it's own varieties within. These are the snake slinkwight, and while there are multiple kinds of snake slinkwights (e.g. rattlesnake, garter, cobra, etc.), there are a small group of more humanoid snake slinkwights. These folk all have tails, but rather than having a snake body or head, they have a humanoid head with scales or even yellow cloven eyes.