Maybe because there are so many games with similar content, I got bored playing them in a row. But when I find a fresh character or a new game, I end up playing it again.
For routes I'm not interested in, I just pick one randomly after looking at guides. I enjoy the characters I like without looking at walkthroughs, though.
I like blonde, silver, and black hair, but I don't like brown. Because, for some reason, he seems like a supporting male lead. Also, the right muscles are needed. And I like red eyes or blue eyes.
I like it a lot. I deliberately only look for that kind of character. Obsessive characters are great, but adding a scheming trait makes them even better.