Who is Dill?

For Scout and Jem, summer means Dill, and Dill's imagination: "Thus we came to know Dill as a pocket Merlin, whose head teemed with eccentric plans, strange longings, and quaint fancies" (1.39). The Finch kids may have active imaginations, but they're firmly entrenched in the reality of Maycomb. Thanks to Dill's outsider status, he can see the Maycomb community from a different perspective.

Here's a link,

http://www.gradesaver.com/to-kill-a-mockingbird/study-guide/character-list/