Caliban is an outcast because his clothing is ragged and dirty.
Caliban is an important character in William Shakespeare's play The Tempest.
His character is one of the few Shakespearean figures to take on a life of its own "outside" Shakespeare’s own work as Russell Hoban said: "Caliban is one of the hungry ideas, he's always looking for someone to word him into being ... Caliban is a necessary idea."
Caliban is half human, half monster.