There are two main answers for me. Number 1 is the amiable family friendly idols. There is a certain charm in watching Arin giggle her way through every paths of life and Beomgyu being sugar (though teasing is his preferred style of combat).
On the other hand, my soul is attracted to idols who are on the offense a la Choi Yeonjun (Bless the Great Push to Tiktok).
Boring idols are also fun