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Ryuji Sasai (b. 1961) was hired to help ease the growing pressure on Square's small sound staff in 1991. Up to that point he co-composed for Xak and its sequel. Sasai was also, and remains to this day, an active bass guitarist. Sasai is best known for co-composing FF Mystic Quest, focusing on battle and dungeon themes. Sasai's style is highly rock-oriented, leaning particularly toward what one might describe as "fantasy rock". His style borrows heavily from experimental rock groups throughout the 70s and 80s. Mr. Sasai will be around through FF7.
Yasuhiro Kawakami (b. ?) was hired around the same time as Sasai and for the same reason. Up to that point Kawakami composed for several games including Shinobi, ESwat: City Under Siege, Scramble Spirits, Tetris Arcade, and more. Kawakami is best known for co-composing FF Mystic Quest, focusing on town and dungeon themes. He is especially fond of varying his chord progressions and harmony, and his melodies tend to feel very nostalgic. His work in FFMQ and Chocobo's Mysterious Dungeon 2 is very ballad-like. Mr. Kawakami will be around through FF8.
Hiroki Kikuta (b. 1962) is in the same boat as the above two. Up to that point Kikuta had written music for anime (and also illustrated manga). Kikuta is best known as the composer of Secret of Mana (Seiken Densetsu 2) and Seiken Densetsu 3. He is heavily influenced by progressive rock, particularly Pink Floyd. His harmonic style is especially unique in the game industry, as is his eclecticism in mixing genres. Mr. Kikuta will be around through FF7.
Kenji Ito's (b. 1968) first job was co-composing FFLegend 2. He is best known for his work on the SaGa series. Ito tends to prefer writing fast-paced, synth-driven rock-inspired music, anime-inspired orchestral music and, by his own admission, "easy-listening" music. Mr. Ito will be around through FF11.