Yurusen is a small, ghost-like character appearing in the tokusatsu series Kamen Rider Ghost. Acting as a guide and mentor, Yurusen provides crucial information about the Eyecons and the spiritual world to the protagonist, Takeru Tenkuji. Although often sarcastic and mischievous, Yurusen demonstrates deep knowledge and assists the Kamen Riders in battles against threats from the Gamma World. Yurusen's comic relief, witty behavior, and unique perspective make the character memorable and essential to the plot.