Romeo and Juliet parents: Nothing really much to talk about except they’re trashy parents. Trying to marry Juliet is a cause for this tragedy. Her mother was even being told by Juliet, she did not want to marry him. 

Juliet Maid: The nurse, by her own thoughtless actions to support the affair between Romeo and Juliet. Her pour judgment on a relationship that couldn’t last due to their family history. 

Friar Lawrence: Friar Lawrence is to blame for the death of Romeo and Juliet because of his way of operation. He did things in secret, not communicating clearly, and not executing his plan. He also married Romeo and Juliet in the first place 

Romeo: Romeo is to blame for him and and Juliet’s death is because he killed Tybalt and got himself banned from the city. I get it he killed Mercitio but there could have been a better way to deal with it instead of killing each other. He killed himself. 

Mercutio: Mercutio is to blame for the deaths of Romeo and Juliet because he was able to convince Romeo to attend the Capulet party. He’s also responsible for his own death because he decided to provoke Tybalt 

Tybalt: The first reason he is to blame for the deaths is that he participated in the fighting at the beginning of the play. He also kills Mercutio and Romeo in turn kills Tybalt which results in Romeo to be banished from Verona. He also played a role in the families hatred towards each other 

In my opinion, it’s not a person's fault that they died but a captain group of people who led up to this tragedy. There is probably more people that could have been blame for their deaths. It’s the people who just pooped out of my head.