Kimetsu no yaiba is the kind of manga that starts off slow, you feel like the author doesn't know what to do, but picks up later on when the mangaka introduces other characters, the characters are ALL lovable seriously! and Tanjiro's personality is not really your typical shonen stuff he's kindhearted and super sweet not hotblooded and impulsive, another good thing is the female characters they're all likeable and useful for a change i really like Nezuko and their brother-sister bond, as for the art many have commented that the characters sometimes look derpy but that's not bad either because it suits the funny moments. Conclusion: give it a chance !