>>5138363Shape Design, Color Theory, Body Language, Etc.
Black is gonna be 'evil', blue and brown, down to earth, pink is going to be cute and feminine.
Triangles are sharp and edgy, rectangles/squares are sturdy, circles are round and soft.
This is true to both anime and western cartoons and character designs, look at your own image, he looks edgy as fuck thanks to his hair alone. Red, black, and white are always a pleasing color combo.
Do character line-ups in trios so they look like they belong together, vary height, weight, etc. Take inspo from different occupations, stories, character arch-types. To be a good character creator you also need to be able to tell a story subtly.
Big shapes that come off of the character make them more recognizable.