I've spent a lot of time building the heroines of Musume, but I've spent almost no time on the creatures that they're going to be fighting. That, however, has changed.
This is very much a work in progress; it's likely that none of the assets you see here (Suzu, the background, the mechanical bug) will make it into the final game. However, it gives an idea of what I'm going for. This game will have big monsters and big robots to fight, and the world will definitely be a post-apocalyptic one (similar to what you might see in Guilty Gear).
By the way, this robot was a pre-made asset that I got from graphicriver.net. Graphic river is an awesome resource for cheap game assets, which definitely what you need when you're trying to create quick prototypes.