Protagonist/Antagonist

This post I would like to start with definitions of Protagonist and Antagonist becuase it is important to know the difference between those two.

Protagonist: The main character in a drama or other literary work with whom we usually symphatize.
Antagonist: The principal character in opposition to the protagonist or hero of a narrative or drama.

The play The Miracle Worker has two main leading characters Helen Keller and Annie Sullivan. I put their names in two different colours in purpose because they can be interpreted either ways but I can also claim that there is neither an antagonist nor a protagonist.

Some people may say that Annie Sullivan is the protagonist because she tries really hard to educate a spoilt, hadicaped children. Annie does it at her family request but then her attitude transform into a pure determination.
Nevertheless sometimes she uses very hard methods including separation from her family so we feel compassion with Helen and this pushes her into a position of protagonist.

In my opinion there is no antagonist or protagonist. The play is based on their interactions. Sometimes they fight and have disputes but on the other hand it all ends happily without any hurt person.