Misery

Frank's daughter and Necro's granddaughter. According to Alex, despite Necro using her body as a vessel, Misery's personality is completely different from her, being much more curious, polite and childlike.

Her ability to become a gate to the Double Helix World is what makes Butler keep her around, considering her a vital part of his plan.

Following Necro and Frank's passing, she seemingly ends up getting adopted by Sally and Alex, to whom she refers as "Uncle Alex"