Wisp

Wisp is a spirit that appears in the early/late hours of the day/night. You must catch him with your net then he will ask you to let him go. He asks you to catch 5 spirits for him & he'll either pull out all the weeds in your town, repaint your roof any color you want or give you an item. He is not a reasonable person to visit, for three reasons:
 * Unless you have not weeded for 2 weeks it's better to pull out all weeds by hand. You can permanantly uproot them by digging them up with your shovel rather then pull them by hand.
 * Unless you have not upgraded to Nookingtons you can always buy a can of paint from Tom Nook. If you haven't upgraded, you can pay off all of your debt & change your roof color. Otherwise, this is the best option.
 * The items he gives out are not generally rare, so you might be able to buy them back from the catalog, depending on which item he gives you.