Cain was an interesting demon. He had a definite presence, a sad backstory, and an awesome head of hair. Cain was a fun addition to the spn universe and here are some reasons to love and appreciate him.
He’s one of the oldest characters on the show, one of the first humans ever and also one of the first demons ever.
He was the first and last knight of Hell. He was created first and died last.
He had the Mark of Cain longer than anyone else and kept it’s homicidal influence at bay the longest.
He traded his soul for his brother, Able’s.
His hair was awesome. Seriously. I adore the long silver locks and the beard.
He invented murder. I’m not sure if that’s an accomplishment but it’s a thing he did.
He fell in love with a human woman named Collette. He gave up killing and tried to be a better person for her and didn’t attempt to avenge her death because he promised her he wouldn’t.
He picked up killing again because…. the plot demanded it? he just couldn’t hold it back anymore. His solution was to kill anyone who ever came from his line which was a pretty high level of brutal and basically needless. (Not a reason to appreciate him, per say but I had to mention it as an edit to the previous point because someone what gonna.)
Master of unimpressed-while-drinking-beer-and-shucking-corn face.
He read Dean like a book, pointing out how Dean would probably kill the three most important people to him in the reverse order that he did.
He’s got one hell of a presence.
He kept bees. Cool hobby and good for protecting bees and the flowers!
He wrecked a whole room full of demons.
He as super neat powers. Making Crowley silent was a really neat trick.
Cain was a super interesting demon. Despite inventing murder and taking on the Mark, he was able to live a relatively peaceful life for a while because a promise he made to his dying wife. He was definitely fun to have around.