Late, but I'll still answer with my thoughts for anyone who may be lurking:
1. For sure thought it was Randal. It's been a while since I've played, but I had a whole theory behind why I thought it was him. Could not tell you what that theory was, but that's the conclusion that I drew.
2. Gol for sure, for the same reason that Kahlandra stated. Knowing what we know about him and his behavior, he certainly reads as a Gol to me. It seems as though he suffers from some sort of intrusive thinking, and the drawings appear to be a way for him to cope with them. Would explain why he constantly draws all over himself. He doesn't seem to carry any paper with him, and I know in one scene he even draws all over a napkin. Sort of like an exorcism of sorts. Same reason that people journal, I think.
3. I thought this was a reference to the stigmata. In some of the promo art/wallpapers (?) Randal is made out to be a christlike figure, and he appears to be drawn in a position that implies he is bearing a "cross" of some sort. The bandages could be a subtle indicator of this.