Nanami Kento is one of the most interesting and endearing characters in Jujutsu Kaisen. As a mentor to Itadori, Nanami won't hold his student's hand or coddle him. Instead, he holds him to the highest of standards, and that's ultimately what helps him grow the most as both a Jujutsu Sorcerer and as a person.
Source:https://www.cbr.com/jujutsu-kaisen-nanamis-best-moments/