Unlike Deltarune, outside of the Riftworlds only humans are present. Humans that enter Riftworlds are given special Riftworld forms based on their personality, appearance, and other traits, given the human in question is in one piece.
Here Robin and Marcie are leaping into the Grand Rift, a larger Rift that is on the ground instead of in the air. Normally, to enter a Rift you would simply walk through it.














