KSSU's personality is pretty unknown, due to her lack of speech. The only way she can express herself is with her face and her voice tone, since what she is saying remains unknown. She is seen to be kind and has others' interests at heart, though seemed to be annoyed when treated like a child, as shown in Hold Your Horseshoes. She likes grammar, as she corrected Monitor in Hold Your Horseshoes. KSSU really cares about her friends, namely 1970's Globey, which leads to her getting aggressive.