I'm real bad at body types and all yours are so unique to your characters? How do I improve my body diversity.
Think shapes not anatomy. Get wacky with, draw exaggeratedly and then maybe try toning those designs down to something realistic (if that’s what you’re looking to do/aiming for) Or even just look at real life people. Go people watching even, like if you’re out and you get a minute just sit and watch the people that walk by. What do they look like? What shapes are they? What physical traits do they have? Once you get an idea of how real normal people look it can give you more ideas and better perspective when developing characters.
OF COURSE this is just in the case that you’d want to do some kind or realism or semi-realism thing, if you want some cartoony or anime types of character designs you just have to let loose and explore different shape dynamics. Look at different character designs ranging from current day shows allll the way back to the old disney animation masters to get inspiration. It all depends on what you want to do.