His appearance is possibly among the most annoying one. But at the very least, Enmu did his job as Tanjiro's stepping stone.
Muzan is a sinister being who has no sympathy towards others, including the demons he has created.
Even though Rui is a lower moon, he still provides a solid fight against Tanjiro.
He is the one who killed the precious Kyojuro, yet it is hard to hate him because he beat him in a fair fight.
Despite his low screen time in the series, Jigorou has established himself as a brilliant grandfather and teacher figure.
Just like Jigorou, Sabito is that one character that has a short yet memorable screen time.
He looks strong and all, but his personality lacks a bit.
Sanemi portrays your typical badass yet rude character tropes. A wind powered type character mostly always be among the most powerful one.
Obanai is equally just as rude as Sanemi, if not ruder. Well, at least he did not attack Nezuko just like Sanemi.