Heroes:
Ihsahn
Devin Townsend
Gene Holgan
Trey Azagtoth
Alex Webster
Steve Harris
Tony Iommi
Bruce Dickenson
Dio
Dimebag
Dave Lombardo
Mike Patton
Satyr Wongraven
Chuck Schuldinger
Derek Roddy
Les Claypool
John McLaughlin
Miles Davis
Pat O'Brian
Kelly Shaefer
Joey Jordison
Jimmy Bower
Dax Riggs
Lemmy Kilmiester
Wendy O. Williams
Sid Vicious
Henry Rollins
G.G. Allin
David Bowie
Necrobutcher
George "Corpsegrinder" Fischer
Peter Tagtren
Rick Ruben
Steve Austin
Elvis Presley
Roy Orbison
Hank Williams Sr., Jr., and III
Waylan Jennings
John Denver
Brian Wilson
Jimi Hendrix
Steve Vai
Colin Richardson
Zeroes:
Phil Anselmo
Will Rhamer
Euronymous
Hellhammer
Nagash
Varg Vikernes
Kevin Sharp
Chris Barnes
Ozzy Osbourne
Tim "Ripper" Owens
That douche from Iced Earth
Marilyn Manson
Corey Taylor
Pepper Keenan
Glen Danzig
Glenn Benton
Trent Reznor
Jim Morrison
Ritchie Blackmore
Yngwie Malmsteen
Joe Satriani
James Hetfield
Lars Ulrich
Kirk Hammet
Dave Mustaine
Bob Rock
Ross Robinson
I'm sure I forgot a lot, but that's enough.
EDIT: I apologize for including non-metal individuals, but I don't really separate those that I respect in music along genre lines.