At first that's true. If you stay with that person and even when the person is attractive but if you don't like the habits or personality, you round drift away from them
It was a classic but you shouldn't try to keep on dragging the same anime this way. That's just my thought we will have to wait and see, just how far this anime could go.
I always choose comedy anime to get rid of the gloomy thoughts. Sometimes I watch gintama and sometimes I opt for Dora the explorer or Mickey mouse just to get my mind off of something
I wouldn't want to see anymore new genres. Yes things could get simple and people can easily search for their desired genre but on the other hand, it's hard to search for similar anime. I am not explaining this very well. Please ignore.
No and if it happened, it's better to check your health first. Only when the emotions get extremely unstable, you notice actual biological disorder and it's not healthy.
We all dislike some of the other character and if you were to change them, the situation, anime wouldn't remain the same. So despite the risk and disgust, I wouldn't want to change any charcter in any anime.