Frisk and friends from Undertale HD Wallpaper

Four anime-style characters are depicted against a bright yellow background. The largest character, presumed to be Frisk, is in the center, leaping forward with an outstretched hand. To the left, a smaller character sits on a dog house, holding yellow objects. Another character, resembling Flowey, is lying on the ground, and a fourth character stands to the right, wearing a purple dress and blue bow.