In Starbound there will be many NPCs.  Something unique about some of these NPCs is that they have many different dynamic appearances so they will rarely look the same twice.  Lets take a look at my penguin as an example.

Penguins can be found throughout the galaxy.  They can be of different species, have different modifications and be different colors.  Some might be rarer than others.  Others might give you special rewards.  The combinations are quite numerous.

These are just a few of the possible combinations.  Enjoy!