So, I am NOWHERE near done with completing Rapacity and I already have my eyes on a Spectrum potion for his alter-ego. So, someone, anyone, discourage me and kick my butt into gear for completing him.

I love bouncing back and forth between my pets, be it their treasures, back stories, or anything else regarding them. It's the joy of having so many. I would love seeing one of them finally done, but in the meantime, I'm far from bored. It'll all get done eventually! If it's on your list of things, don't worry about what order you do it in, that's my advice. :)
But... if you're really that adamant, GET BACK TO WORK ON RAPACITY OR HE WILL HATE YOU FOREVER!!!
Well, if you are burned out on something, sometimes going off to do something completely different can help. Or, who knows, doing his alter ego might actually net you some new ideas for him.