Nikolay Kruglov.

Kruglov is a police major and deputy head of the Federal Expert Service (FES).

A tall, stately man with broad shoulders and a strong build. His figure and bearing immediately mark him as a military man or a member of the security forces. His gray hair, which suits him very well, is neatly cut short. He has an open, masculine face with large features, a strong chin, and a deep, penetrating gaze from his intelligent eyes.
The character's signature voice is a low, velvety, confident baritone that can sound both soothing and threatening during interrogations.
Kruglov favors a practical and masculine style. He can most often be seen in leather jackets, classic jeans, simple sweaters, or tailored dark suits. His look is devoid of pretentiousness.

Nikolai Petrovich is a counterbalance to the young, technology-driven FES experts. He draws on classic detective experience.
Kruglov is skeptical of some cutting-edge gadgets (though he acknowledges their usefulness) and prefers time-tested methods: interrogations, field work, witness interviews, and confrontations. He has a phenomenal sense of deception and excellent intuition.
During interrogations, Kruglov can be tough, ironic, and assertive. He is a brilliant psychologist, capable of cracking even the most cunning criminal.