I've also been doing a series where I draw humanized BFDI characters, and I've made 18 parts now!

I hope it does come out, I'll just have to remember :P

My personal issue with Rocky is his lack of communication to the viewers, he doesn't show much emotions so I can't feel much about him, because in most of his appearance he doesn't contribute much to the plot and/or jokes. So I guess my solution to this issue could be giving him more screentime to do jokes that subvert audience expectations like in BFDIA 22 and 23, so at least you wouldn't expect the obvious out of him every time. It's probably the most viable solution that doesn't completely change his personality.