Cool!
These characters would indeed make terrific comic characters. They have a lot of motion to them, and, like a good cartoon character, have a really defined look that can't be confused with anything else. The Wrangler looks exspecially cool, I wouldn't mind seeing him from different angles.
Perhaps work more on definate proportions, the 2-headed gremlin's arms are a bit off from eachother, for example. Other than that, it looks really great!