Calvin has a wide variety of monsters living under his bed. They vary in appearance, but they nearly all have tentacles. The monsters have tried to eat Calvin on many occasions, but have never succeeded in getting him off the bed. Perhaps the most well known of the monsters under Calvin's bed are the monsters Maurice and Winslow. That is that they are not exactly the most well known, they are just the only ones named. Winslow is a annoying talker. Maurice, it seems, is something of a bumbler. It is apparent that the monsters are not there all the time, as in several strips Calvin and Hobbes hide beneath the bed. Light is lethal to the monsters.
Meaning
Watterson has often used monsters as metaphors for his own life. For example, in one strip, Calvin is seen throwing garbage to the monsters because he wants them to leave him alone. This parallels, Waterson's life when he returned from sabbaticals, behind on deadlines and often throwing out mediocre strips that he was not satisfied with.
"It'll build character!"
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