Yuzo Hayashi is a composer and arranger who plays keyboards and piano, mostly on video game arrangement albums. His sound throughout is typically that of an eclectic fusion of synth‑electronica, rock and jazz. He has worked on many «Super Arrange Version» arrangements on Falcom works including Special Box '91 (Disc 2) and Perfect Collection Ys, II & III (Disc 2) and Snatcher -Zoom Tracks-.

Hayashi also has frequently grouped with session musicians under different group pseudonyms with Kanichiro Kubo (synthesizer operator), Jun Kajiwara (guitar) and Osamu Koike (sax) for various video game arrangement albums under groups, most notably Insector X, Fire Emblem ~Character Theme Collection~ and Fire Pro Wrestling Ring Combination Tag in addition to various Falcom albums.

Associated units/groups include Hayashi Orchestra (Insector X, Fire Emblem ~Character Theme Collection~) and H & K Project (Fire Pro Wrestling Ring Combination Tag).