10, maybe?
Ok, looking good.
Cartoon Elasticity is a fine name. Make X = 1d10 rounds in each case.
1d10 rounds is fine by me, I'll Update it.
Rage for 1d6 rounds?
I don't think Unintelligibility needs to be an SQ, just in the language line.
DC 20 to end the rage, maybe? Even with Iron Will, that's not quite a 50% chance to end the rage.
The universal solvent bit looks good.
If you want to put in a Sense Motive check for the speech, that works. Maybe DC 15 each time he speaks?
How about 11 rounds, like a barbarian with his Con? Otherwise, just until he or his opponents are dead.