An understated factor of compelling characterization, the visual design of a character can be just as important as their personality or narrative development. Strong character design serves to make a hero recognizable and encompasses the nuances of their subtle quirks, traits, and ideals through visual aesthetics. A well-executed design speaks louder than words or actions, instantaneously telling the audience everything they need to know about a character, from their general affiliations to the most intricate aspects of their personality.
Source:https://www.cbr.com/anime-with-most-unique-character-designs-ranked/