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Shizune is the assistant of Tsunade and a talented Medic-nin. She left Konoha with Tsunade after her uncle, Dan, died, and trained under Tsunade for many years afterwards. Shizune is quite close to Tsunade, being one of the few people Tsunade will trust with absolute certainty. Unlike Tsunade, Shizune is level-headed, practical, and a rational thinker.

Source from Wikipeida