One characteristic of being human is the ability to extend ourselves beyond our genetic programing. Frankienstein was nothing more than the compilation of other peoples parts but somewhere in that schmorgasboard he came to be. He was only peices of others but he came to be an individual, a distinct and unified whole.
Not to mention some of his actions in the novel were very compassionate, beging the reader to question who the really evil character was.
The ability to live in such a concious state where we can ponder our existance and anilyze our surroundings. To have intellectual dominance over all other forms of life, to withstand most disasters that wipe out entire species.