Lament, aka "Deutsch Synchro", is a Curtain agent sent to the Brink to assassinate three targets. She is undercover as a bartender. As of "Orbital Pt. 1", her handler was killed 'yesterday', and in addition to the assassinations she has been ordered to investigate an "unsanctioned Divinity" detected aboard the Brink.
She is a human-like android with flawless skin, bunny ears and a kind smile. She wears gloves and a flattering blazer in the style of King in The King of Fighters 2003, and always carries a concealed weapon.
Paris France is aware of her true identity, but keeping it a secret. She's 'helping' 3T establish a network of allies sympathetic to his cause.
Trivia
'Deutsch Synchro' is German for 'German Dub'. It is used on the streaming service Crunchy Roll.