I've been tinkering around with the level editor, and I've noticed something off with the Sumo NPCs. No matter how big they are, if your Player Character gets one iota thiccer (0.1 on the fatness scale), they suddenly become as vulnerable as normal NPCs to a smashing; effectively negating their purpose as obstacles.

It seems that the weight of the Player Character themself is a factor here, as I've tested out gaining that 0.1 amount of weight using both normal NPCs and Thiccs. In addition, if the PC hasn't gained weight yet, smashing an NPC or a Thicc that adds no weight whatsoever (0.0 on the scale) doesn't make the Sumos vulnerable.

P.S.
A smaller issue, but I've noticed that Thiccs that are set to 0.0 scale pre-testing revert back up to 0.5 scale after a test.