One of the underground man’s former schoolmates, whom he sees at Simonov’s apartment and at Zverkov’s going-away party. Ferfichkin was the underground man’s “bitterest enemy” in school, where he was a show-off. After the underground man insults Zverkov at the party, Ferfichkin threatens the underground man, and the underground man replies by challenging Ferfichkin to a duel. Ferfichkin and the other party guests find this ridiculous.