Tiger's Eye sent Hebihanabiko to enter Pegasus (who, in the real world, is only a shadow) when he came to help the Sailor Scouts fight him. Tiger's Eye left afterwards, not noticing that it was Rini (as Sailor Mini Moon) who was falling asleep. Hebihanabiko attempted to tempt Rini into using Pegasus to rule the world (so as to drive him out of her dreams), but she refused. Pegasus awakened and sent Hebihanabiko out of the dream world, and Sailor Moon destroyed her with Moon Gorgeous Meditation.
Instead of legs, she has a tail which connects her to a shadow on the ground and can stretch any length. This is similar to the the Shadow Sirens, Beldam, Marilyn, and Vivian, from the game Paper Mario: The Thousand-Year Door.
Hebihanabiko is the first character to discover whose dreams Pegasus is hiding inside, but she is defeated before getting the chance to tell Tiger's Eye.
Unlike most Remless, her task is to find Pegasus rather than fight the Sailor Scouts.