I really, really dislike being negative about anyone's efforts. However, I got this product (and a number of others from this company) in a cyber monday sale for 20 cents each and I was ripped off even at that price.
The characters presented are ill-conceived, uninterestingly presented, and in some placed show gross misunderstandings of the M&M rules. These are the kinds of characters that one constructs when they are bored, just learning the rules, and playing around with a character generator. I can't judge what this characters might have been. Given the time to be further developed, or subjected to the scrutiny of an editor, they might have been more. However, they seemed that they were simply accumulated, sorted by concept and then published without any real scrutiny.