I've been thinking of expressing Bug typing more along the lines of something like Shuckle, which is hard to peg to any particular kind of insect, but looks "bug-like" to me nonetheless.
So I've been working on a "bookworm" design:
I've got a few other ideas too, but this was the first one that inspired me to do a sketch. It will need some more detail, but I don't plan to overload it. I want this to be simple and cute, but still look fully evolved. This sketch gives you the basic idea. Not sure if I'll pursue this further, but it has a few elements that could be fun to finish. Integrating the book cover with a nifty pattern, or maybe have cover shapes inspired by Unown based on IV's. Also the feather quill is begging for a backstory.
Comments welcome, and we'll see where this goes...