|image from Video Games Densetsu|
You can see more production sketches of Shin Waku Waku 7 on Video Games Densetsu. Unfortunately, that's all you're going to see, as Sunsoft hasn't expressed any interest in reviving the series beyond releasing the Neo-Geo version of the first game on the Switch. It doesn't help matters that Kouki Kita, the lead character designer for Waku Waku 7, died last year, but it wouldn't be hard to imagine another team taking this baton and running with it. Shin Waku Waku 7, by Skullgirls creators Reverge Labs? Hey, a guy can dream!