Boo Radley of Harper Lee's To Kill a Mockingbird is a dynamic character, a character who undergoes animportant and essential change in his personality. For Boo Radley his change is more of a metamorphosis as he emerges as a real person rather than as a mysterious figure who comes out at night to peer in Stephanie Crawford's bedroom window or one who leaves mended pants on a fence wire and small gifts in a tree knothole.
In the final chapter, with the impetus of the friendship which he has cultivated by means of the knothole, Boo exerts a heroic effort to come outside one night when Bob Ewell threatens the lives of the children he has come to love. He wrestles with Ewell and stabs him.
Boo's emergence as a real person rather than a "haint" brings together the motif of Robinson-Bob Ewell with the Boo Radley motif and effects Scout's final lesson in the novel.