Character Break 

A temporary deviation from one's personality.

Despite Don's well known hostility toward Michelle, he made a character break, by hugging her upon learning of her parents' car accident.

Character Break by Mick the Dick October 9, 2011

breakout character

on a TV show, or in a series of movies, the breakout character is the character that comes out of nowhere and steals the show.

The Fonz, Alex P. Keaton, Steve Urkle, and Stewie Griffin are all breakout characters.

breakout character by Drama_King January 28, 2009