what do you learn about dill's charcter

Dill (Charles Baker Harris)

A friend of the Finch children, who is a little older than Scout, quite short for his age, has an active imagination, and exhibits a strong sense of adventure. He initiates the first expeditions toward the Radley house, and is Scout's best friend. His family life is less than ideal, and he tends to resort to escapism when confronted with difficult situations. Dill spends summers with his aunt, who lives next door to the Finch family.

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