Bishounen: Literally means "pretty boy," as in an attractive member of the male gender. Also spelled "bishonen," and sometimes shortened to "bish" and "bishie/bishy." It is a Japanese word, adopted by female anime fans in the rest of the world to denote any male anime, manga, or video game character they happen to find good looking. Strictly speaking, "bishounen" should only refer to boys under age 20, since a "pretty man" would be "biseinen." However, most people prefer to use bishounen for men and boys of all ages, as it is so widely used.
Based on that ^ most of the characters whom I love and refer to as bishonen fits, however if you look at the more stylistic/physical elements (see below) most don't fit at all.
Opinions on which males are bishounen and which are not vary according to personal tastes. The stereotypical bishounen generally has long hair, a slender, graceful figure, and lacks facial hair. Bishounen tend to appear androgynous or feminine. They are also likely to have certain personality traits, like sensitivity, secretiveness, moodiness, refinement, and a dark, tormented past.
If I was to refer to bishounen based on that description, it would be more appropriate to consider Nuriko/Yuki. While I place Nuriko as my third fave from Fushigi Yugi I wouldn't say I like him from the 'bishonen' aspect. I like his personality. (wow that sounded cliche
) That's true for most of the characters I like, most of them tend to be a mixture of spontaneity, angst and 'goofyness' as I term it. I prefer the personality traits that most seem to have, besides if a character is overly effiminate it turns me off. (I don't mind them pretty but if its 'over the top' I tend not to like them as much. Take Millefeuille from Sorcerer Hunters (the series) as an example, he's a bishonen, but I haven't printed pictures of him off to stick around my room and oggle on occasion.)
Personality is what draws me to a character. If they happen to look good i it's just an added bonus
but yeah.. bishies. there are so many of them. 
