Shisui was very kind, lacked arrogance, and had a very down to earth individual. He was very open-minded and states his opinion honestly on any matters. He cared about the village as a whole and not just his clan, a trait Itachi shared. When it seems that the Uchiha are plotting a coup, rather than an all-out massacre, he suggested the idea of trapping them under a genjutsu (Kotoamatsukami) to the upper echelons.