The main characters in the series are the titular “Rookie”, and his mentor and father figure- “Senior”. Both are parasites from a distant planet sent by “The Hive”, and are assigned to destroy the earth and not fail where other parasites have. With Senior being their most seasoned veteran agent yet, he is expected to succeed in the hives final attempt to destroy the earth. But if all else fails, the hive may make its own way to earth and make that planet its new nest to continue to breed new parasites.

Intelligent and well-adjusted member of his towns society, and is going into college now that he has finished high school with flying colors. With his guardian- Senior, pushing him to get into a highly distinguished school, Rookie wants nothing more than to make Senior proud. Rookie can be dumb, reckless and subjected to easy peer pressure from people he trusts at times, but with his moral compass firm despite shaky self-perception and confidence- Rookie is adaptable with a touch of assertive, dominant strength when those he cares for become threatened. Rookie is a Vegetarian, unable to bring himself to eat meat.