East is a main character as well, however for the beginning of the story, he doesn't take up as much space - as the story goes on, his presence and character becomes more and more relevant in the plot, and gets an increasing amount of lines.

I can't say much about him here without a bit of spoilers, but he is a very troubled character. He is the one that struggles with mental illness the most, and he's a bit complex - being able to articulate complex emotions vocally within a wide range is definitely a major need for this character.