Divine Gluttony: an ability of Donald Steel to have a perfect digestive system. Its teeth slice through the elementary particles that make up an object, and even the strings that make up the space-time the object inhabits; its saliva improves the flavor of whatever is being eaten and negates Low-mid regen; its stomach acids subatomize the body, melt away the soul, and can cancel regen up to the high end of low godly (low godly that doesn't require a soul, but some other abstract thing, low godly from another plane of reality, or low godly via type 9 immortality) if the entire enemy is eaten; its intestines fully convert whatever was eaten to energy (via E=Mc^2) to refill stamina and use low mid Regenerationn.
Basically this allows matter, space time, an soul manipulation with limitations, as well as regen negation (low-godly) under pretty specific conditions.
I'm not sure if I can do this as well (if not then just go with the first), but it's something that goes hand in hand with the other power.
Rainbow Gluttony: After eating something, Donald can copy any of its abilities that can be associated with one of the colors of the rainbow to a "move pool". When Donald transforms to post litter box it can choose one ability of each color to"set". For example if Donald ate Goku, it could set super Saiyan to yellow, SSB to blue, and KaioKen to red. Or if Donald ate our planet, Earth, they could set creating volcanic eruptions out of themself to red, set growing plants and forests from their body to green, etc.
This one allows power mimicry under specific conditions
These are only post-litter box.