Sergey Maisky

Overall impression: A brutal, tall man with a striking appearance, which is described as a mixture of "biker and pirate."
Face features: He wears a distinctive beard and often appears with a slight unshaven head.
Hair: Long hair, often tied in a ponytail, is his trademark.
Style: The style of a "rock musician" and a biker: black leather jacket, earring, wristbands, chains.
height and weight: 197 cm, 109 kg.
age: 40 years old.

Professional qualities: He is a professional "chameleon" capable of infiltrating anywhere. He acts as the FES's assault force, often conducting interrogations, putting pressure on suspects.
Personal traits: Devoted to the fighting brotherhood, which sometimes creates problems. Despite the image of a tough guy, he resents being teased and is able to be shy of women. He takes justice seriously, putting it above instructions.

He works in the Federal Expert Service (FES)— an elite unit of the Ministry of Internal Affairs created to investigate particularly serious crimes.
He holds the position of an operative with the rank of major.

Musician and biker, plays guitar, sings in a rock band.

He grew up in a single-parent family, a single mother. In one episode, it turns out that his father is an FSB agent.

Service in the GRU: For many years he served as a major in the GRU special forces, having the call sign "Spring". He specialized in undercover work, which became his calling card.
Invitation to the FES: He was personally invited by Galina Rogozina precisely because of the experience of implementation.

Galina Rogozina: Head of the FES, Colonel. It was she who personally invited Maisky to the service, having seen his unique skills.

Nikolai Kruglov: Rogozina's deputy, Major. Appointed "from above", one of the veterans of the department.

Ivan Tikhonov: Head of the computer department, a brilliant programmer.

Valentina Antonova: A forensic scientist and pathologist, Rogozin's longtime friend.

Tatiana Belaya: Specialist in ballistics and tracology.

Konstantin Lisitsyn (Major).

Konstantin Kotov (captain).

Yulia Sokolova (captain, then Major).

Stepan Danilov (captain).

Pavel Granin (captain) — got into the FES on the recommendation of Maisky himself.

Leonid Subbotin (senior lieutenant).