Ruka has defined facial features such as her sharp nose and long eyebrows. She has large glazing eyes, and a small mouth, with semi-long black hair tied loosely at the end in a ponytail. She is only seen wearing a traditional kimono in a series of flashbacks.
As opposed to her husband Shinjuro's loud personality, Ruka is depicted as being wise and graceful. In the manga, she is seen teaching Kyojuro the importance of his life and need to use his strength in order to protect the weak and helpless people in the world.
Ruka is the mother of both Senjuro and Kyojuro, and is the wife of Shinjuro. Some time after giving birth to Senjuro, she developed a disease and was left bed ridden up until her death.