I would say Ellie Goulding could act Harely if she could indeed act.
Some clickbait website said they were looking at Anya Taylor-Joy.
Maybe she could play a younger poison ivy.
I could see her as Duela Dent.
Yes, Anya could play a good villain generally, but if she gonna be that sort of demon, I think being Poison Ivy is more appropriate.
She'd be fine but I'd prefer someone Riley Keough or Emma Stone.
Anya's eyes are way too far part, she shouldn't be in any movie.