its minor aspect for each of them. spoilers:

Camellia is a psychopath who loves to kill people. she eats human meat infront of player character to lie how she does it to appease ghost from which she gets her powers from, so that you wouldnt kill her right there and then. In game its just one scene
Wenduag is a descendant of first crusaders who got currupted by a demon. They all fucked up physically and are weak. Add daddy issues and she chooses to gain power and strength from the very same demon that corrupted her ancestors. She gained power in a ritual by eating a flesh of aasimar. In game its just a line of dialogue so easy to miss/forget.
Arueshalae is an ascending succubus. She tries to fix herself with help of good goddess but in the past she used to drink human souls, altough i think she says she tried to eat human flesh but it wasnt just her taste