Glad you like the comic!
I draw animals, partially because it helps give the story a far more fictional tone than, say, Ghostbusters(snort), but mostly because I really kinda blow at drawing humans. Plus, I can have a lot more artistic license with character design(read: Lancaster's funky hairdo or Belknaps grossly enormous forearms).
As for Plasmata, I came up with it when I started working on the series, and I wanted ghosts to be made out of something more original than just ectoplasm. Plus, I can make up my own rules for what it is and how it works, which is the most fun of making your own comic
