Yukky is an alias of Yuko Takahashi (
http://vgmdb.net/artist/9997)
Kemy is an alias of Cyborg Akemi (
http://vgmdb.net/artist/14667)
Gyragyra Megane Dan is an alias of Jun Wakita (
http://vgmdb.net/artist/3276)
All these appear credited as such on
http://vgmdb.net/album/24053
Masashi Honma (
http://vgmdb.net/artist/13690) has a couple of pop'n music aliases: Bikke, Uncle Motchee, Re Mongkoh (adding credits in process, can add as aliases preemptively)