Jin is described to have a fussy personality, though he is capable of being very calm, similar to his daughter. He is also mentioned to have a surprisingly light and cheerful voice at times, contrasting The Steering Committee.

Jin is strict to the whole school, but has soft feelings for Kyoko. He was impressed by how much she had already discovered when he asked her to investigate the Izuru Kamukura Project and The Tragedy of Hope's Peak Academy but in the end he asked her too