I like what they taught about color schemes like polar opposite colors, etc but I think it kind of limits the colors that you should use for a character. Thoughts?
Nah, I think they hit it right with the color examples. Loved that character color key example. As a newbie at art, I fell into the trap of sticking too much to color theory.
On that other topic, the reason they kept most characters similar is because DoTA is a really high learning curve game so a lot of people won't want to relearn character appearances.. and they already have a lot of memorable characters who they don't want to lose.
Are there any tools that analyse how much value is used on a sprite or what colors are used most?