(To be honest, I am not really much of a fan of Hellaverse but I like Millie a lot, honestly she is great if you ask me)

Mildred Knolastname[12][13] (née Haymurder[1]), more commonly known as Millie, is an assassin at I.M.P, Moxxie's wife, and one of the main protagonists of Helluva Boss.

She is the exciteful powerhouse of the I.M.P gang who always fights alongside Moxxie.