Guilford Gain is a Columnar working for Exanceaster March as valet and bodyguard. She (and/or her face) resembles a candlestick phone.
This section contains spoilers for The Road to PALISADE 19: Upstairs & Downstairs Pt. 2.
Click here to reveal.
Guilford is revealed to be an undercover agent of Millennium Break, who has infiltrated March's staff to get into the Somerset House and free the trapped Branched, Thalia. Despite initial interference from the staff, she succeeds in her mission and escapes into the night with the other operatives and Thalia, destroying the house in the process.