For me personally, it's pretty difficult to choose which character I like the most in Kimetsu no Yaiba, because I've read the manga and I know all of their backstories.
BUT DO LET ME KNOW YOUR FAV CHARACTERS IN THE COMMENTS BELOW!!
P.S Check out the details in both the manga and the anime, both are pretty amazing, the art is beautiful. I still prefer the manga, however the animation is really really perfect to suit the anime too.