Even then, LoI just gave him a voice and small bit of personality. He was still sort of shallow. I never understood why Death serves whoever has the crimson stone. Whats in it for him? WHY did he serve Walter?
Lol. I see what you did there.
Death NEVER served Walter. That's a misconception that many picked(as well as believing Walter's "You betrayed me!!" was meant for Death, when it was ACTUALLY meant for Mathias). It didn't even state specificially that Death serves Mathias SOLELY because he wields the Crimson Stone(as IGA says, the Crimson Stone was just a means for Mathias to become immortal, and it becomes useless afterwards, yet Death still stays loyal to Dracula, even after Dracula's soul is born into Soma, and the Crimson Stone is forever gone). I think Mathias's alliance with Death was forged through some other means. He was just announcing that he was offering Walter's soul to the one who kept the Crimson Stone(which was Mathias). Walter could only stand at Death's threshold if he was widdled down by a powerful warrior who wielded the only means of harming such a vampire, the Vampire Killer. Death couldn't just kill Walter and give his soul to Mathias to become a powerful Vampire himself. Considering what Death is, and what vampires are, Death has no dominion over immortals(duh, they can't die).
As for Zobek being Death, I'd rather not. I never was fond of the idea that Death was once an actual human being. It's an idea that was tossed around in fanfic theories on this board before. To me, Death should always be death. A being the transcends creation, at the most, or at the least, I might be able to swallow Death only being human once if he was the FIRST human(Adam, or something), died and was offered the role to usher all of life to the netherworld. But Death being some knight? I can't swallow that. Death should be far more ancient than that. Original Death had the idea right(even appearing as some strange Death God in SotN, like that was what he was worshiped as by some ancient civilization). I can only swallow Zobek as being Lord of the Necromancers.