Kazuyuki Sekiguchi is a professional composer and bassist in Japan. Since the 80's, not only has he been performing music professionally, but also the bassist of Southern All Stars.
In 1987, when Hudson Soft was producing its Momotarou Densetsu series of games, he was approached by the game's designer, Makira Sakuma, to do the game's music. He accepted and has since worked on most of the games in the series. As a result, a caricature of him can be found in some of the games.
Taken from here.