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Gerson Boom, known only as Gerson in Undertale, was a lauded historian, author, and teacher in Hometown. He is the father of Father Alvin, who once drew a picture of him that can be found in the School's unused classroom.
It's likely Gerson is going to play a role in the future, with his already existing connection to the Delta Rune from Undertale, and now his huge influence in the Deltarune universe, despite only being a minor character in Undertale.
In Undertale, Gerson is the character who explains to us about the Delta Rune. He seems to possess far more knowledge about the Delta Rune than most. Not only that, he's full of wisdom, having been a veteran of the war between humans and monsters. Notice how the crystals are blue and pink.
Gerson is great, easily one of Undertale's most fascinating NPCs in design, personality, and role in the game's backstory and metanarrative, and with Deltarune giving Gerson a great role in...
When looking farther into it, I've found that he might be the key to unlocking the secrets to the Dark World. For this theory, I will be expanding upon another theory about how the Dark World works based on a couple of key concepts. This first theory is that the Dark World in Deltarune is an abandoned Dungeons and Dragons game.
