While Zenkichi's appearance and demeanor suggests he is untrustworthy, he is actually deceptively intelligent and easygoing, and doesn't conceal any hidden motives. However, Zenkichi also has a comical side to him, having a tendency to panic or overreact when he's caught off guard that usually involves him speaking while shouting in dismay, most prominently seen in Sendai when he scared a child while trying to help him find his mother because he was screaming at his fellow backup officers when they turn him down.