"大学で読んでいた劇には、ゲイのキャラクターやトランスのキャラクターが登場していた。"

Simplified Meaning:

When someone says that the plays they read in college had gay or trans characters, they mean that the stories had people who were attracted to the same gender or who didn't feel that their birth gender matched who they were inside. Imagine reading a book where one of the characters is a man who loves another man or a woman who feels more like she should be living as a man. Seeing these characters in stories helps us understand and accept people who are different from us. For example, if you read a play about a boy who wants to dress and live like a girl, you get to see the world from his perspective. You might feel more empathy for people who go through similar experiences in real life. The next time you meet someone who identifies as gay or trans, you might remember what you read and be more respectful and open-minded. By reading about diverse characters, we learn to appreciate the many ways people can live and love. This makes us kinder and more understanding, which helps create a more accepting society. If we apply this approach in our lives, we can build friendships with all kinds of people and support each other better.