Lucifer Nigorikawa is a figment of Ichikawa's imagination in Boku no Kokoro no Yabai Yatsu.

Not quite a real "character" per se, Nigorikawa is an imaginary figure that Ichikawa conjures up to help himself deal with his emotional shortcomings. He is largely based off of Nigorikawa-kun, the male lead of Yamada's favorite shoujo manga, Your Color's Octave. The "Lucifer" moniker and the associated black wings he sometimes sprouts are additions from Ichikawa's chuunibyou delusions.