She is the typical female rabbit who no one really talks to because she is considered odd, yet she is quite the opposite; Ume Cottons has a shy personality but is creative. She is secretly in love with Oswald—she talks to him often, but has never dared to confess her feelings. Ume is afraid of messing things up, as she tends to feel a heavy sense of guilt; she can be quite sensitive when she makes a mistake. She drinks energy drinks daily, which causes sleeplessness and dark circles under her eyes. Ume also struggles with insecurities about her appearance, believing she would look odd in a dress—even though she actually looks pretty.
