Shizune Katō

Shizune Katō is a jōnin of Konohagakure. An apprentice of the legendary Sannin Tsunade, Shizune became a talented medical-nin under her tutelage; also becoming her companion during her sabbatical from active shinobi duty. After Tsunade is persuaded to return to Konoha to become its Fifth Hokage, Shizune assumes the role of her assistant — a role she would retain long after Tsunade retired from the post, performing the same duties for the Sixth and Seventh Hokage.

Appearance
Shizune is a fair-skinned woman of average height and slender build with onyx eyes and jet-black hair; her hair is straight and shoulder-length with bangs that cover her ears and frame her face. Normally, Shizune is seen in a long bluish-black kimono with white trimmings, held closed by a white obi, and open-toed sandals with low heels. Shizune has also been seen wearing the standard Konoha shinobi outfit complete with flak jacket, when deployed on missions which has distinct, extra-long sleeves. She, however, doesn't wear a forehead protector. Shizune also has the tendency to pin her hair up when working; a trait also shared by Sakura.

Personality
Shizune is always level-headed, practical and a rational thinker. As a result, she is the one who tends to stress over details, such as Tsunade's tendency to gamble frequently, and to think with her heart. She often gets comically worked up over any irrational decision Tsunade makes. Shizune also looks after Tonton, Tsunade's pet pig. She is a very kind and calm person but will immediately rush to Tsunade's aid and in contrast, will become fierce and somewhat ruthless; a testament of her loyalty to Tsunade, including losing her temper when anyone insults her. At the same time however, she is not timid and is not afraid of objecting to Tsunade's decisions or voicing her opinion as seen when she even alerted the Konoha Council to Tsunade's intention to send Naruto on a mission that Shizune thought would put him in great peril. She has a great sense of morale and ethics, as she tried to persuade Tsunade from accepting Orochimaru's offer to heal his arms in exchange of reviving Dan and Nawaki, believing the said two would not be happy to return at the cost of innocent lives.

Abilities
As a jōnin and apprentice of Tsunade, Shizune is undoubtedly a very capable kunoichi.