I'm likely gonna update this rig later so more can be done with it when animating, but for the time being, this is what he looks like. I based this off of what Kirby looks like in Smash Ultimate when he inhales Steve or Alex. It's a bit basic, but I didn't want to over complicate things.
Download:- http://www.mediafire.com/file/90kxo078zplvkur/Kirby.zip/file
Update:- Okay, so I can't really think of anything futher to add to this rig, so I've decided to just put it up for download so anyone can use it as they like, because I'm not sure how I'd use it, and I don't want it to go to waste. There are two files, one with a mouth that can't be bent and another one that does have a bendy mouth, mostly for frowns and smiles. The eyes can also bend a bit for angry and sad expressions.