Moeka Kiryuu is a supporting character in Steins;Gate, known for her quiet, withdrawn personality and obsession with using email to communicate. She is a Rounder agent working for SERN and serves as one of the story’s key antagonistic forces, though her role is layered with vulnerability and loneliness. Her actions help drive the plot’s darker mysteries, especially around time travel and SERN’s surveillance. Despite her cold exterior, she is portrayed as deeply isolated and tragic.