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I used to be a hero myself, back in the old days. Gerson, the Hammer of Justice. Gerson ( /ˈgɜːrsən/) is a vendor found in Waterfall. His shop is located in a small cave east of the houses of Napstablook, Mettaton and Undyne as well as north of the river where the River Person is located.
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...
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.
I've been thinking about how Gerson in Deltarune seems to have some parallels with Gaster. He doesn't appear in person, but is constantly referenced. He is described as "brilliant" before dying and being replaced by Alphys. In Deltarune, this information comes from Alvin; in Undertale, from the Gaster followers.
