How Many Characters Do You Need in Your Pitch?

Keep the number of people in your pitch to a minimum, probally at that makes more sense. So here's an example from the upcoming book, pilgrim's progress, reloaded by my brother david umstadt. This isn't his real pitch, but i think it's a good illustration of what a pitch with too many characters would look like. Christian is a cychlopath in power armor. To escape, he must face irradiated swamps of despond, demonic supermutence and the dreaded platitude platipus.