KAY/O joined Valorant as a robotic initiator designed to counter ability-heavy teams, and his ultimate, NULL/cmd, became one of the game's most recognisable team-fight tools. When activated, it emits a pulse that suppresses enemies, preventing them from using abilities for a short time. Clips of the activation spread through Valorant montages, streams and Discord soundboards, where players reuse it to mark a decisive push. It remains popular because it instantly tells other Valorant players that the round has shifted.