For the waifu demographics who like to fantasize until they find someone IRL, or just wanna marry that fictious one (not judging). How do you think designers/creators manage this? Individuals have their own personal values and tastes. My theory is that a base personality character is created for individuals to relate to, but from there you add your own ' with your own personal compatibilities and tastes as long as it's consistent with the character's core personality. This allows the consumer to enjoy that character and still appeal to mass (+ merchandise!).
An example are the Hyperdiemsnion series. It caters to a variety of demographics too. It's cute girls doing cute things, there's yuri teasing, and there's waifu component (esp evidenced by waifu CDs, etc).
Plus how would you respond if you felt your favourite character's personality and a trait did not blend? Would you feel comfortable altering it to something you like as long as it works with that character's core nature?