In the novel "Frankenstein" every narrator is speaking through a first person perspective, so that we as readers can relate to their inner and outer conflicts, issues, and situations. It would be very hard for any narrator speaking from their own perspective to serve as a reliable narrator, particularly when the situation that they are narrating has affected them personally, or has caused turmoil in their lives. Just imagine: Could Victor EVER be able to be objective in his life again telling this story after the can of worms he had just opened? Could he be fair to anyone connected to the story when he has been the main agent provocateur in this particular plot? Nobody, not even the creature as the narrator, could fairly be seen as reliable because each of these characters has a deep conflict to resolve and the problem was caused by a chain of events that, unfortunately, bound them to one another.
no he is not because he is just not.