I'd say Masaki Yamada/Akira Takasaki/Taiji Sawada/Munetaka Higuchi but that would be cheatin'... :twisted:
Let's see...
Vocals: Ronnie James Dio [Dio, Elf, Black Sabbath, Rainbow, etc, etc...]
Guitar: Zakk Wylde [Ozzy Osbourne, Black Label Society, Pride & Glory...]
Guitar: Dimebag Darrell (RIP) [PanterA, Rebel Meets Rebel, Damageplan]
Bass: Taiji Sawada [X, Loudness, D.T.R, Cloud Nine, Otokaze...]
Drums: Aquiles Priester [Angra and some other bands I can't remember...]
Keyboards: Jon Lord [Deep Purple]
If that's not against the rules I wnat to come back and create a japanese-only one... Of course, Taiji will be in it too... xP