Have you ever thought that the idols and biases you have may reflect the ideal partner you strive for?And also the idols you intuitively seem to be attracted by, may possess the qualities (before you find out) that you look for, or are compatible with (blood type, horoscope?) Sometimes people you are intuitively attracted may have more to them than just a pretty face you claim to have randomly pointed out. I've found this with my biases.
They tend to be B blood types (AB or B) and O (since I'm an O). And horoscopes that are compatible with Cancer. Perhaps these are reflected in their personality and so when I watch footage of them, I get drawn to their personality??... it's a mystery.
Anyways, I tend to instinctively pick out idols that catch my eye who possess one or more of these compatibility points and then I start learning about them and ranking each idol choice one by one.