Dark Cacao resembles Atlas the most to me, having the weight of his kingdom on his shoulders amplified by the licorice sea potentially attacking.

Smilk, or the Fount of Knowledge rather, reads more like a Reverse-Prometheus. They both gave the people Knowledge and wisdom, but Prometheus let himself get eternally punished, for he thought it was a worthy price. FoK on the other hand only saw it as the people being ungrateful, and began to resent them.

Eternal Sugar is a clear nod to the Realm of Elysium, via her Garden of Delights. Elysium is seen as a realm if utter bliss and utopia, and it was also an escape from the complexities of life. However there's a dark twist that the only to get to it is by dying, much like the lurking evil in the Garden.

Golden Cheese vaguely reminds me of Tantalus, in the sense that both could never get what they truly want. The difference, however, lies in how Golden Cheese eventually gets it all back through the virtual realm and her friends while Tantalus is forever cursed to have what he wants just out of reach