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Goblin
Mythical Origins
Understand goblins come from myths; they're classic fantasy creatures like in 'The Hobbit'. 
Ugly Connotations
Goblins are described as ugly to express they're not only evil, but also visually unappealing. 
Mischievous Nature
Goblins can be tricky or mischievous, causing problems out of spite or for fun. 