Animal Crossing: New Horizons/Special Visitors

Celeste
Celeste is an owl who loves everything space-related. She may appear after 7 PM on the player's island. The player then can talk to her to get a space-related DIY Recipe.

Daisy Mae
Daisy Mae is the granddaughter of Joan from previous games. Like her grandmother, she visits every Sunday morning to sell turnips.

Gulliver
Gulliver is a sailor who washes up on the beach. Talk to him a few times to wake him up and he will explain that he needs to find the five parts of his communicator to get help from his crew. They're hidden on the beach, they will splash water like a Manila Clam and must be dug up with a shovel. Return them to him and he will send you a gift in the mail.

Harvey
Harvey is an artist from a nearby island. He invites you to visit him and use his photo studio, Photopia.

K.K. Slider
K.K. Slider is a musician who will appear on the player's island every Saturday, once the player has gotten their island to a 3-Star Rating. Once it is 6 PM, the player will be able to request a song to be played. He will then give the player that song so that they may add it to their collection, but he will only give one song to the player every Saturday.

Saharah
Saharah is a traveler who sells rugs and "mysterious" wallpaper and flooring. Each rug comes with a number of exchange tickets. Five tickets may be redeemed for a free wallpaper or flooring.

Wisp
Wisp is a ghost who appears at night. He himself is easily spooked and will separate into five spirit pieces after he meets you. Once you capture all five with your net, he will reward you with either something new to your catalog or something expensive.