AA's only skinny relative to buffed-up characters like Legacy and Haka and so on. He looks pretty "average healthy male human" to me, not skinny.
The Scholar is the only overweight character, in how many is it now? 26?
All the other males that aren't hidden in a suit are muscled up.
There's also Dark Watch Nightmist. She seems to have put in some weight, to me at least.
Again, she looks a relatively normal healthy size (despite having a waist only a little bigger than her head - I can forgive that in comic style) which just contrasts with the lighter build of every other female except Sky. Even Sky with her muscles is pretty slim.
Not that I don't see your point or anything, but I wouldn't let a little thing like character design keep me from buying the game. I mean, even if you don't like the character direction, that doesn't mean the character's personality is going to be affected. It's just how they look. Why should something superficial like the characters' appearance matter so much that everyone is acting like the company is going downhill?
I hate to be a dick about it but with respect, this seems to be a bigger deal for women than men, and that's almost certainly because of the way female characters are portrayed (if they exist at all). It's hard to see why it matters when you aren't affected as much.
Character design is not a little thing. Not for me, and not for a lot of people. If it isn't important to you, that's fine, but not everyone is you.
I can't speak for the others who have commented, but for me I'm expressing my concern that Adam's art is moving towards what I'm tired of seeing in comics, board games, movies, ads, video games, etc. It would suck for an IP that made me happy with its inclusivity and portrayal of female characters to move away from that into being just another game where women are reduced to boobs and butts.
And it genuinely concerns me that the art might move so far in that direction that some potential customers will be put off, and that would be very sad. I don't think the company's going downhill, but I needed to express my opinion that I don't like the direction the art's going in even though I do like the art (it's the subject that I have issues with). I just think it's something >G needs to think about.