When I am doodling away on my self-published comics, I can really disappear up my own creative tail-pipe on the preparations sometimes. I may spend days and days designing a character who only appears in one or two panels, drawing pages and pages of thumbnail sketches, and spending hours and hours thinking up names and back-stories and all that stuff…. none of which shows up in the final book.
Case in point, an airborne adversary for Rocket Rabbit, THRUST MONKEY. He's a jet-pack powered bad-guy who, by the way, rolls (and flies) with JUMP CHIMP (posted earlier) a rocket-boot sporting fellow flying simian, both of whom are members of the APES OF WRATH, a freelance co-op of hairy marauders, each of whom got way more pencil mileage than was really required.
But on the other hand, playing around with all this stuff is the fun part of doing personal projects. And I get to post the left-overs in my blog.