A Re-Deconstruction of Deltarune's Ralsei

Ralsei, of Deltarune fame, is a fascinating character in his own right. With all of the mystery that surrounds him based on both the incomplete nature of Deltarune as well as the rich writing of the character himself, there is a lot to analyse. I’ve never done a character analysis on this channel before, so who better to take a look at than everyone’s favourite fluffy boy? I better, since people voted for it! Hopefully you can find something new here that you haven’t heard before.
Timestamps:
More Than Just a Lore Pit (Prelude): 0:00
The Fluffy Prince… (Who is Ralsei?): 3:17
Made of Pure Darkness (The Thematics of Ralsei): 10:01
Oh Damn I Did Not Know That (Mystery Machine): 18:52
Who Knows What It Represents? (The Synthesis): 25:35
See You In The Next Hell, Losers! (Postlude): 33:03
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Music used:
Welcome to the World of Pokémon! (Pokémon Mystery Dungeon: Explorers of Sky)
My Castle Town (Deltarune)
Swirling Void of Nothingness (The Great Ace Attorney: Resolve)
The Dark Truth (Deltarune)
ANOTHER HIM (Deltarune)
Here We Are (Undertale)
Undella Bay (Pokémon Black 2 and White 2)