Dill is a good actor when the children act out different parts of Boo Radley’s story. Gothic refers to a supernatural element, so Dill can act scary parts well.
When the children get together during the summer and act out Boo Radley’s life, or other plays, Dill always plays the villain. He is so good that he could even seem tall if the part required height.
Dill was a villain's villain: he could get into any character part assigned him, and appear tall if height was part of the devilry required. (ch 4, p. 27)
Dill is particularly good at Gothic scenes. He can do what is needed for the dark and scary roles, since Gothic stories have many supernatural elements. To Kill a Mockingbird has several Gothic elements, including reclusive monsters like Boo Radley and many important scenes that happen at night.
With the Finch family, Dill finds a home. He is more than willing to be the scary character in the Finch children’s play. He enjoys being the villain, and playing the Gothic parts.