Mitsuru Matsuoka (松岡 充 Matsuoka Mitsuru) is a Japanese actor and singer. He's known for being the vocalist of the band SOPHIA. He played Katsumi Daido/Kamen Rider Eternal in Kamen Rider W Forever: A to Z/The Gaia Memories of Fate and Kamen Rider W Returns: Kamen Rider Eternal, along with voicing Kamen Rider 4 in D-Video Special: Kamen Rider 4, a special DVD given away to the first 1,000,000 people who watched Super Hero Taisen GP: Kamen Rider 3Image:Icon-crosswiki.png.