While a route and character can pull me in emotionally, I never actually feel anything for that character, knowing that it is merely a character. Sure, I usually try to create arguments in my head where I attempt to justify that particular route being the "true" route (whenever the true route isn't specified, and as long as the main heroine/route isn't really obvious), but I never consider myself to be part of that route. I never consider myself as the protagonist, but merely as a watcher/observer who can occasionally influence stuff.
Even if the character is memorable, they are merely just a character.