Victor has lost his humanity at the end of Frankenstein since he becomes obsessed with finding the monster instead of forgiving it.
At the end of Frankenstein, he has given up his humanity, since he still wants revenge, even once he's dead.
The major theme in Frankenstein is revenge.
Frankenstein is a novel written by English author Mary Shelley that narrates the story of Victor Frankenstein, a young scientist who brings a hideous creature to life in an unorthodox scientific experiment.