Gerson

Gerson () 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.
== Profile ==
=== Appearance ===
An elderly looking olive green tortoise-monster, Gerson wears archeologist attire, with a pointed beard, a large magnifying glass, and a tan pith helmet. His teeth are crooked and yellow and his shell is a dark brown color with a pale cream rim. He also seems to be unable to open his right eye.
=== Personality ===
Due to living for a long period of time compared to other monsters and from studying history, Gerson has gained many knowledgeable insights about the history of monsters in the Underground, including the Delta Rune prophecy. Despite this, he seems to have trouble remembering certain information such as the location of Temmie Village and why Asgore was nicknamed "Fluffybuns." He also does not want to repeat the legend of the prophecy again if the protagonist asks him to. He was alive when Toriel also ruled the Underground with Asgore and while stating that it was tragic that she left, there was a bit of relief due to them being open to their affection to one another.
He was also known to be hero in his youth, with his nickname being "The Hammer of Justice." Undyne was known to look up at him when she was young and still respects him as she grows up. Gerson appreciates her willingness to join him in his youth despite some of the trouble she caused back then.
In the Genocide Route, while still providing service to the protagonist, he reacts more colder to them, being shocked that they want to talk to him, and hopes that hero (likely referring to Undyne) would defeat them. It is also shown that he has a pessimistic belief about monsters being free from the Underground since humans would kill them if they would escape and felt betrayed when Asgore changed his mind from the belief. He does hope that he could save the lives of some monsters by letting the protagonist talk to him though.
== Dialogue ==
== Gallery ==
 Gerson tarot.png | Gerson's official tarot card as Major Arcana IX, "The Hermit".
 Gerson screenshot shop.png | Gerson's shop.
== Trivia ==
* Gerson's name is likely a reference to an infamous Super Smash Bros. match involving 2 players: Gerson and SuPeRbOoMfAn. The match lasted over 50 minutes due to "turtling" from both players.
* When attempting to name the Fallen Child "Gerson," the response becomes "Wah ha ha! Why not?" and allows the player to use the name.
* According to Undyne, Gerson fought in The War of Humans and Monsters. If this is true, this places Gerson among the oldest characters in the game alongside Toriel and Asgore and also the oldest character biologically as Asgore and Toriel do not age.
** As most monsters are based off animals from the real world, Gerson as a tortoise makes sense as the species is known to live up to around 150 years.
* One of the tracks associated with Undyne, Spear of Justice, may be a reference to Gerson's title as the "Hammer of Justice."
** When selecting "Hero" in "Talk" on the Genocide Route, he hopes that the hero would "strike [the protagonist] down." Before Undyne becomes her Undying form, she declares that she would "strike [the protagonist] down" as well.
* When selecting "Threat" in "Talk" on the Genocide Route, Gerson says "I know you can't here." which is a possible 4th wall break, referring to the fact that the player cannot attack in shops.
* A character named Gerson Boom of presumably the same species as Undertale's Gerson appears in Deltarune as the deceased father of Father Alvin. His grave can be seen at the Cemetery.
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