Yohei Onishi (大西洋平) is a Japanese singer, songwriter and composer most known for performing the opening theme songs to Shuriken Sentai Ninninger, Mashin Sentai Kiramager and Sasaki and Miyano (the latter as a member of ミラクルチンパンジー /Miracle Chimpanzee) . He is also a member of Project.R, provided the singing voice for the Jikuu Driver in Kamen Rider Zi-O, and has written songs for numerous artists, including 内田彩 (Aya Uchida), petit milady, 佐藤拓也 (Takuya Sato), CUBERS, and 8P.