WBP, BBP, RHP, Mihawk, Doflamingo, Law and SHP are super popular!
Many of WG, Kaido, BM are less popular maybe because they don't travel too much and stay in their countries or somewhere for too long.
For example Kaido stayed 20 years in Wano except some short voyage, so i don't think 100% people know Kaido's appearance. But i guess since he is the WSC, people fear him af.