Towa is probably the nastiest EN. She traffics talents while in Japan using her position of power in the company and films them doing filthy, disgusting things to use as blackmail leverage. She once made Bae cancel stream because she got her sick after giving her laxatives and going ass to mouth.
She also roofied Biboo and broke her hymen and forced her to get an abortion after impregnating her adolescent eggs.
This isn't even getting into the torture stuff, either. I just wish new talents knew about her and Sora's "hazing" before it was too late.