Steve, whose exact species is unknown (though it has been speculated that he may be a dinosaur or lizard) is the co-protagonist of the strip. Steve possesses superior intelligence and technical expertise, and has been known to create robots, time machines and other advanced technological devices. However, Steve's inventions rarely function as planned, often leading to disastrous results. Furthermore, Comic 232 implies that in most cases, Steve never really invented any of those things and just stole them from the future. To where he probably got by using a stolen time machine.
Steve is more spontaneous than his companion, Beaver, and is the source of much of the "unfeasibility" of their adventures. Somehow, Steve's mere presence attracts strange creatures such as sentient turnips, the Shoe Goblin, Satan, and various fairies.
Steve is generally friendly and well-meaning, with a few exceptions (often involving pandas). His amiable and overly-optimistic nature often renders him oblivious to the sinister intentions of others (see Comic 49).
Steve has also been known to enjoy childish games, such as pretending to drive at the front of a bus or playing pirates, which have often led to unfortunate and rather unfeasible accidents.