For anyone who doesn't know, it's a series where the main character, Myfanwy Thomas, wakes up not having any memory of who she is or where she's from and she kind of has to make her way through her day job. Which is working for a kind of spy organization where everyone has powers.
Gestalt is actually a set of quads. Two identical twins and another boy and a girl. But between the four of them, there's only one personality that can use all four bodies at the same time.