Mark Okita (マーク・大喜多 Māku Ōkita) provided the voice of the Decadriver, Diendriver, and K-Touch in Kamen Rider Decade. He also provided the voice of the Tournament Announcer of the Rider Battle in Kamen Rider Decade: All Riders vs. Dai-Shocker.
On October 23, 2014, he and Masahiro Inoue promoted the release of the Complete Selection Modification Decadriver. Okita has revealed that he recorded new sounds for this new release.
In Kamen Rider Zi-O, he returned to voice the Neo Decadriver and Neo Diendriver.
Outside the Kamen Rider series, he provided the voice of the announcer in KOF: Maximum Impact 2 and Regulation A.