Pushkin appears to wear a hooded parka on top of a tshirt. He is mostly bald with a small tuft of hair that is on the top of his head. He is seen carrying a gun.
Pushkin seems to be a rather animated man who takes great pleasure in seeing strong ability users suffer. He refers to himself as a weakling, acknowledging his lack of physical strength. Despite this weakness, he appears to be proud of his ability.
Alexander Pushkin has a very strong ability, causing the Port Mafia and The Detective Agency to nearly kill each other. A Feast In The Time Of The Plague (疫病の時代の饗宴, Ekibyōnojidai no kyōen) allows Pushkin to give someone a special type of virus normally with the help of an another person like Nathaniel Hawthorne and Ivan Goncharov.
No further details is said about the ability's virus. However, it is said that, when inserted to two people, it can cause the two people to fight each other to death. The virus inserted in the survivor will be gone and the other one dies fighting.
Alexander Pushkin's first real debut was in Chapter 51. At first, he lies to Atsushi and Akutagawa that he knows nothing and is just involved with the Rats in the House of the Dead for the money. Under this guise, Pushkin reveals the entrance to the Rats' hideout. When Akutagawa and Atsushi reach the entrance, Pushkin pulls a gun on them, revealing that he is the virus ability user. After infecting Akutagawa with the virus, Pushkin escapes using a mine cart.