2 of my favorite guitars come to mind here when you speak of passion. Gary Moore is second to none when playing with passion and soul, and he’s not a bad singer.
My favorite is of course Steve Marriott, whose passion and soul as a singer was unmatched, and he was a very accomplished guitarist as well. Not to mention he was approached by Jimmy Page to be the singer for Zeppelin, and by the Stones to replace Brian Jones. He was too big of a presence for Jagger, who vetoed him because he was a much better singer, and was too much of a volatile presence to be tamed by Zeppelin.