Effie went from cute airhead to... something else.
Felicia's doesn't seem like it fits her to me, but I'm probably too used to her original voice.
I kinda like Nyx, it fits her "child-like" thing.
Leo and Takumi were exactly what I expected.
Most likely they won't go to that extent though. Probably gives you a text box saying "You and X had a pleasant conversation!" instead of actually conversing with them.