Well, Travelers are not that interesting for me. Skitter will be probably next, once I figure out how to make interesting swarms of insects. I am more interested in characters with some strong visual theme or idea behing them which pretty much removes all the generic heroes that have just skintight costume or generic armor and visor. So for example pretty much all of the cases 53 or Slaughterhouse 9 are quite interesting to draw, on the other end of the spectrum you have people like Triumph or Legend.