Kallen's general personality is that of a strong willed, determined, loyal and brave individuel, who can also be quite short tempered and impulsive at times; She is also compassionate, quite sensitive and truly gentle to those she cares about, and has a strong sense of justice. While being presented as a cheerful kid through past pictures within her house, she doesn't show much of this side of her anymore within the show, being fully focused on the rebellion and her determination to take back wh