Montresor

... Quiet, Reserved, Sulty, Flirtatious. Montresor is a woman who, at a glance, seems rather put together and sane.
She is anything but.
Montresor is a woman who's gone mad with regret and grief, mad with want and desire, mad for a world she will never be able to have again. While she is quiet most of the time, she often goes on long dramatic monologues about a story she is seemingly obsessed with before quieting down once again.
While she seems to be the calmest of the sinners in the submarine, she is quick to hold petty grudges and is very much okay with killing others if it means correcting any supposed wrong she's received.
Overall, she is insane.