Jōno has the calmest, most composed personality of the Hunting Dogs unit. However, he does not take interruptions nor injustice lightly. As such, he nonchalantly arrests Osamu Dazai upon their first meeting, expressing his thoughts against Dazai's blood-covered past with great disapproval. Jōno hides a fierce temper behind composed expressions, mixing them with harsh threats and remarks towards his comrades. Jōno also detests intense emotions and abrupt changes in moods from those around him.