Board Thread:OCs and Character Development/@comment-1945898-20140831151912

So, recently, a former background character of mine named Reagan, who, [with starting my story about him] has gone from 'the only pleasant child in the Hammond family', to someone who tries his hardest to remain cheerful even in the face of his family abandoning him.

Now my question is this: Does anyone find themselves developing characters that were originally just meant to be in the background? 