While initially showing himself as an ordinary, clumsy and worried middle-aged man, Mori later reveals that not only is he good with strategies and planning, but also a cruel and merciless person capable of infusing fear on his enemies.  However, his cruelty is not for cruelty's sake. Mori always weights the gains and losses of his decisions, these decisions leave a bloodstained path and have hurt and traumatized countless other people, with Yosano and Dazai being prime victims of his abuse.