In chapter 3, Donyatsu gets attacked by the Machumaro, and they take a bit from his back:
With this, we know that (at least) a superficial layer of his body is composed of some kind of pastry, which is even edible.
We also know that Donyatsu needs to eat, which means he somehow has a digestive system.
In chapter 13, however, Donyatsu is seen standing in the rain:
How can he stand in the rain and not melt (he has a sugar coating) or get soaked (since he's made of pastry)?
Furthermore, how exactly does his body (and of the bodies of the rest of his gang) really work, physiologically?
