Rukia Kuchiki, from the anime and manga series "Bleach," is initially depicted as serious, disciplined, and reserved. She has a strong sense of duty as a Soul Reaper. Over time, her interactions with Ichigo and others soften her personality, revealing a caring and protective nature. Rukia can be both witty and sarcastic, adding a touch of humor to her interactions. Her growth involves embracing her emotions and forming close bonds with friends.