P.U.5.5.Y was never a playable character, he was just Professor Julius's robot sidekick. I only think he appeared on the Rat Attack title sequence just floating around. Back then, he didn't even have a body but I think it would have been good if he did and you could choose to play as him.
Being the illustrator extraordinaire and wondrous wordsmith that I am, I will endeavor to entertain you through the pages of this blog. I am still not sure if there will be any point to my ramblings but I feel that it has to be done so I am doing it. May God have mercy on all our adorable souls.