source: google images
Another connectin I made between the monster and Donnie is that both understand the feeling of being alone, as Donnie says, "She said that every living creature on Earth dies alone." Although Donnie is not technically fully alone like the monster, he feels alone in that he is the only one that can understand his thoughts and actions because of his mental condition. It's almost the same for the monster because he is also the only one that knows why he does what he does.
Both Donnie and the monster do bad things and live a lonely life, but it is the fact that they both die alone which is where the real connection is seen. No matter what they could have done, it was inevitable that they were going to die alone. It was a matter of deus ex machina for both of them which led to both of their deaths. The act of God for Donnie was the wormhole and the act of God for the monster was his creation from nothing. Although both of these characters represent a different genre, there are similarities in characteristics that one can learn from from both of these works. Both of their stories are tragic, and they both end in death, but it is important to take away that both of these fictional works will somehow improve one's intellectual abilities.
source:google images