River Person

The River Person is a purple butterfly who provides transportation services to Sanddin, Coral Reef, and Humidland on his wooden boat for the Underground. The protagonist can request a ride to any of the locations above if the protagonist reaches Humidland on any route.

During the trip, he has a list of messages he can say at random, often being a hint to a secret or an allusion to something in the game, or just something cute. At least one hint – the hint to finding Marinette Village– is specifically scripted to occur.

Trivia

 * Sometimes his boat has the face of a parrot and flies on top of the water.
 * The River Person's gender is decided, as he even dismiss it as not mattering. However, his model name is model_riverman, hinting that his gender is male.
 * The River Person is used for public transport in the Underground, as implied by calling Papyrus and Undyne.
 * The River Person is the only butterfly that has nothing do with the monarch butterfly.