Tsuyoshi Sekito (関戸 剛, Sekito Tsuyoshi, born April 3, 1963) is a Japanese video game composer, arranger, and musician who has been employed at Square Enix since 1995. As a composer, he is best known for scoring the video games Brave Fencer Musashi (1998) and The Last Remnant (2008). He also plays the guitar in the rock bands The Black Mages and The Star Onions; both groups arrange and perform compositions from the Final Fantasy series.

Takeharu Ishimoto (石元 丈晴, Ishimoto Takeharu) is a Japanese video game composer and musician. Formerly employed by Square Enix, he joined them in 1999 as a synthesizer programmer on Legend of Mana, and worked for them on several games. In 2002, he was promoted to the role of composer, beginning with World Fantasista. He has since composed for several large-budget games, such as The World Ends with You, Dissidia: Final Fantasy, and Final Fantasy Type-0. In addition to his work for Square Enix, he is a composer and guitar player for the bands The Death March and SAWA. He left Square Enix at the end of 2017, becoming a freelancer.