|This article is about a/an actor who originally appeared in in Kamen Rider 555.|
Kohei Murakami (村上 幸平 Murakami Kōhei) is a Japanese actor from Tokyo. He is known for his portrayal of Masato Kusaka/Kamen Rider Kaixa in Kamen Rider 555 and as Yuji Nakajo/Hikomaro/Giza/Hikaru in Cutie Honey: The Live. He also has a role as SpaMurasaki on Nippon Television's parodic Bihada Sentai Sparanger which looks at various onsen throughout Japan.
Particularly, Kohei loves his role in Kamen Rider 555 very much so that he set up a "913 Festival" on September 13th since 2010, also having some special celebrations on the day. This eventually turned into what Kamen Rider fans call "Kaixa Day", an internet meme holiday where fans "celebrate" the character of Masato Kusaka.
On September 13, 2015, he announced that he would reprise his role as Kaixa in the upcoming video game, Kamen Rider: Battride War Genesis  On the same day, he appeared as a guest in a Kamen Rider outdoor stageshow to show off his transformation pose dedicated to his fans.
- Kamen Rider 555 - Masato Kusaka/Kamen Rider Kaixa
- Kamen Rider Kabuto - IT President Uemura
- Cutie Honey: The Live - Yuji Nakajo/Hikomaro/Giza/Hikaru
- Kamen Rider G - Medical Experiment
- Kamen Rider Decade - Masato Kusaka/Kamen Rider Kaixa
- Ultraman Mebius - Hiroshi Isana (guest appearance)
- Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai - Masato/Kamen Rider Kaixa
- Doubutsu Sentai Zyuohger - Bud