萱野, Masked Rounder

She is first introduced in 'Boukan no Rebellion' as a masked woman, working for SERN, who confronts Suzuha in 2036 after her failed attempt to snipe the commander of the "Rounder Executive Squad" (after failing to assassinate Makise Kurisu beforehand) ~! She is the one who murdered Suzuha's mother in 2036, shortly before she went back in time to 2010.