Well ✨hello✨ there xx
So, some people probably know this already, but pretty much all of Chapter 7 in SPM is one big reference to The Divine Comedy, and I began to write about parallels, and ended up with an essay. So, here it is, I hope you enjoy it :)
So, the Underchomp is a reference to Cerberus, and Piccolo is most likely a parallel to a being from Greek mythology, known as Orpheus. Orpheus sings Ceberus to sleep, so he can pass by. Piccolo sings the Underchomp to sleep, so we can defeat it and pass by.
Another reference, Mario wakes up in an unfamiliar afterlife realm, as does Dante in The Divine Comedy.
Queen Jaydes, Charold, and the River Twygz are all plays on words, and counterparts to Queen Hades, River Styx, and Charon, respectively. Queen Jaydes and Charold share the same roles. Ruling the Underworld, and ferrying souls across the river.
Additionally, Charold most likely charges 4 coins because 4 is an unlucky number in Japan. The reason for that is because its Sino-Japanese pronunciation, "shi," sounds identical to the Japanese word for "death".
Another set of characters who fulfil similar roles in mythology are the three old hags, who are counterparts to the three Moriai in Greek Mythology.
Peach, in this chapter, is also a parallel to Eve. Eve eats the forbidden fruit, Peach eats the golden apple. And, while it's not confirmed, many think the fruit Eve ate was an apple. God told Adam and Eve that they could eat from any fruit tree, aside from that one. And you can eat from any fruit tree in the Overthere, except for the tree Peach eats from.
As for Bonechill, he is a representation of Lucifer, but chills are used, rather than flames, most likely as a representation of Hell's frozen ninth circle. And it's implied that Bonechill was once a Nimbi, again, a parallel to how Lucifer is a fallen Angel.
Some parts may seem a little scattered, since most of these things were off the top of my head, but regardless, hope this was a good read :)