The former members of HIM are:

-Juippi — Drums (1991-1992)
-Tarvonen — Drums (1991-1992)
-Oki — Rhythm Guitar (1992-1996)
-Antto Melasniemi — Keyboards (1995-1998)
-Sergei Ovalov — Keyboards (1999 touring only)
-Juhana Tuomas “Pätkä” Rantala — Drums (1995-1999)
-Jussi-Mikko “Juska” Salminen — Keyboards (1998-2000)

source: www.tv.com

+++ VOCALS – GUITAR – BASS – DRUMS – KEYBOARDS +++