-Younger brother to Shisui -Son of Kagami and some Hyūga girl -mom died early on (child birth??) -reason Shisui had kotoamatsukami was due to increased yin chakra from Hyūga blood. -Danzo took Zanzo before Uchiha massacre and put him in root program hoping zanzo would unlock koto like his brother -danzo died while zanzo was still in program -zanzo graduated to ANBU shortly after