While Peter seems to be a pretty well-mannered man, his teaching skills seem to bore the class, as displayed by Ruby Rose, who was sleeping, and Blake Belladonna, who was uninterested in the subject. He also seems to joke around in teaching, as he tried to make the class laugh by calling the Grimm "prey", but was met only with silence.

He's also shown to not be above flirting with some of his female students, playfully flirting with the trainee Huntresses such as Yang Xiao Long, much to her discomfort. He has also proven to be quite confident in his abilities as a Huntsman, often telling stories of his feats. He even has a gold bust of himself near his desk.

Despite these seemingly self-absorbed traits, he is not truly arrogant and he has his moments of humility. Peter also seems to not be afraid in speaking the truth, such as mentioning Weiss Schnee's poor attitude and lack of gratitude for what she has. He also wishes the best for his students in general, as shown in "Family", in which he encourages Yang to overcome her fears and don the prosthetic arm.

It is also revealed by Bartholomew Oobleck in "Family" that Peter is afraid of mice, to which he responds angrily but comically, explaining why he fears them.