Here is a list of Classic H50 stock company actors who may still be around today. I looked through IMDb to get this information; there was no indication any of these people had passed away. Are there any more? Stock characters are typically people whose names would not be in large credits at the end of the show.

Number followed by C = Classic H50, R = Reboot

Bob Basso (8C)
Carole Kai (6C)
Claudia Lowndes (5C)
Dana Lee (1C/3R)
Daniel Taba (5C)
Dick Kindelon (110C, Casting)
E. Lynne Kimoto (5C)
Ed Fernandez (13C)
Elissa Dulce (9C/1R, 9 Magnum)
Geoffrey Heise (3C/3R)
George Herman (14C, see Wikipedia under GH/playwright)
Joe Moore (11C, KHON)
Jorie Remus (6C)
Kimo Kahoano (9C/1R)
Laura Sode (a.k.a. Laura Sode-Matteson) (15C)
Linda Ryan (11C)
Lou Richards (7C, still active 2016)
Luella Costello (a.k.a. Luella Anne Zimmelman?) (7C)
Lydia Lei Kayahara (a.k.a. Lydia Lei) (6C)
Lynne Ellen Hollinger (11C/1R)
Norman DuPont (10C, born 1927?)
Patricia Herman (12C)
Pauly Gardner/Gardener (3C)
Randall Kim (3C)
Remi Abellira (8C/1R, see Linkedin)
Ric Young (1C)
Roland Nip (2C/1R)
Terry Plunkett (16C)
Walter Omori (22C, all uncredited!)
Winston Char (18C)

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These two actors had passed away:

Alan Naluai (March 2001)
Fred Ball (December 2017)