I've revised my voice headcanons for the misfits and the clusterfucks.
Lenore -> Maggie Robertson. Her deep, rich tone would suit her well. If she can lower it enough to pass off as a man for the flashbacks, even better.
Annabel -> Jodie Comer. After seeing her play Villanelle from Killing Eve, there is no way I wouldn't pick her to play the psycho with a soft spot for her special someone. Minus the Russian accent, of course.
Duke -> Zeno Robinson. I like the light tone, and after hearing Hawks from My Hero Academia, he has shown that he can give the perfect amount of attitude and daredevilry too. Add a French accent and it's gold.
Prospero -> Gianni Matragano. A wonderful low timbre with a smooth edge. A subtle Italian accent that surfaces only every once in a while would be the cherry on top.
Ada -> Colby Minifie. High pitch that can go squeaky, morally inconsistent, chasing power in unhealthy ways, a side of actual humanity. Essentially, she would just have to retake her role as Ashley from The Boys.
Morella -> Saoirse Ronan. Irish accent (which needs to be watered down a bit, Morella doesn't have a thick one), soft, airy voice. She can play sweet and sensitive, as well as fierce.
Berenice -> Karen Obilom. A mellow timbre on the deeper end of the spectrum that can offer both warmth and spiciness.
Eulalie -> Karen Fukuhara. A bubbly, silvery tone that can convey eccentricity, elegance, feistiness and empathy at the same time.
Pluto -> Tom Holland. The Britishness, the thin pitch, the energy of an awkward young man who can deliver some savagery when pushed.
William -> Ethan Nestor. Quirkiness in spades, a reedy voice like a clarinet that can also grow very quiet.
Montresor -> Dacre Montgomery. Imagine Billy Hargrove from Stranger Things with a cowboy accent and huskier tone, I dare you to tell me that's not him.