First I'd go with the idea that "Before doing any equalization, EQ or anything, just play wiht the phonemes until she sounds understandable raw" that's one of the core concepts I try to always apply because I feel like this is important for it to actually sound good without relying too much on effects.
As an instance for my song "Pour le futur" where I used Miku English
I used this effect chain I often use

(I've split it into two different EQs but basically it can totally be done in one)
I tend to on the contrary cut the lower end and also add some delay to make the voice more "wet"
As an instance for my song "Pour le futur" where I used Miku English
I used this effect chain I often use

(I've split it into two different EQs but basically it can totally be done in one)
I tend to on the contrary cut the lower end and also add some delay to make the voice more "wet"