Characters who have self-serving personalities or tendencies, and may or may not show it in interactions, actions, emotions, intent, and thoughts. Or just that the character has a willingness to do things that aren't compatible with our modern and diverse views regarding morals, ethics, principles, and ideals of good. Of course these books have different tones and also handling of this subject.

The list was created with much subjectivity, as I won't put protagonists whose good qualities overshadows all their impactful grey actions and evil actions, which is important to me regardless of whether they are truly good or evil. -> Different examples of who I won't include are Song Shuhang (kindness), Klein Moretti (principles and heroic actions), Kim Dokja (altruism), and Chen Ge (goodwill and generosity).

Work in progress. Of course I have read these, I will simply state if I did not. Most are good novels but I will add some non-favorites, which is purely my opinion because I have a personal standard of quality.

UNRANKED

Let me not bother about my face and recommend my list for top quality novels I've enjoyed:  https://www.novelupdates.info/viewlist/16488/