Quote Originally Posted by Grey_Wolf_c View Post
So I'll change my argument to point out that white slaads are large, and that's too big for the umbrella, and white slaads don't have child versions like we tend to assume for everything else.
I'm with Kish here - Large seems fine given how frequently Large creatures are depicted as not much bigger than Medium ones.

Quote Originally Posted by lio45 View Post
True, but now that you’ve mentioned it, an ever-boiling mess of flesh would not always have a mouth, right…? It’s kind of a Protean drawback (compared to normal monsters, who can always be assumed to be able to eat and spit, at any time)
I'm not a fan of the Protean but I don't think this is an obstacle at all. If he's compelled to do something then he'll do the necessary shapeshifting to make that thing possible.