Only Sane Doll: When it comes to killing Chucky is a psycho. When it comes to every day issues, like domestic disputes with Tiffany, he sees himself that way.
Serial Killer: A hedonistic one, as he mentions that killing "helps [him] relax". It may explain why he can't keep himself from killing other people instead of seeking out his single target in the first three films; he's so angered over his plight that murder takes the edge off of it for him.
Stupid Evil: Could possibly explain why he kills minor people when he should be focusing on his target.
Especially apparent in Child's Play 2, where he wastes time messing with Andy's homework and playing the part of the doll rather than take Andy's soul
Averted in Curse of Chucky however He plays the doll role to the hilt, and successfully frames Nia for murdering her family as a result, then has Tiffany get him to her niece, nearly (if not for some offscreen event) getting her body. He also would have presumably easily knifed Andy to death had Andy not had a shotgun waiting .
The Bad Guy Wins: The main story of Curse of Chucky. He sucessfuly pins his crimes on Nia after killing her mother, getting his revenge on the person who put him away, then makes his way to her niece. The Stinger subverts this, with the reveal he didn't get her body somehow, and instead he promptly gets a shotgun to the face from Andy.
Crazy-Prepared: Had a shotgun within a moment's reach in Curse, just in case Chucky happened to come back.
Genre Savvy: Figures out Chucky's pulled the same tricks he did on him on another child in Child's Play 3 and, after receving a mysterious package, has a shotgun ready and waiting for Chucky in Curse of Chucky.
Official Couple: During The Stinger of Curse, it is revealed that she is still dating and possibly married to Mike, the cop who gunned down Charles Lee Ray in the first film.
Berserk Button: While she kills for fun, she hates when people she has an affection for are treated like crap. When she catches a couple stealing the money she gave Jesse and Jade after they get married, she wastes no time killing them with a champagne bottle and a ceiling mirror. When Redman insulted Tilly, Tiffany who at a moment in her life where she vowed not to kill, snapped and gutted Redman. She also hates when her ideas of marriage are laughed at. Chucky learned that the hard way twice. Once when she mistakenly thought he proposed. The Second time was when Jesse and Jade used her advice against her by starting an argument between them.