Curly Brace is very vocal and highly emotional in contrast to Quote, who is quiet and hardly shows any emotion. She cares for the Colons and is always ready to help anyone in need. While she is generally cheerful, her reaction to her own foggy memories of the war reveals that she has a deep sadness and some measure of self-loathing for being a robot. At the same time, her cheerful nature can also distract her from these dark moments.

Curly Brace has motherly inclinations, and is fiercely protective of the Colons, going as far as to attack Quote and Misery in their defense. She is willing to sacrifice her own life for the people she cares for, as shown when she gives Quote her Air Tank, allowing herself to drown in his place.